Last week we showed you a bid request in which an SSP took twenty dollars out of a thirty dollar CPM, and an industry that looked straight at it and changed the subject to plumbing for eight weeks. It was like watching a man find a raccoon in his kitchen and respond by reorganizing the spice rack. Everybody catches it. Nobody wants to be the one holding the ruler.

So this week we went looking for the people who make the ruler.

We found one. She's funny, she's blunt, she swears like a trafficker at 11 p.m. on the last day of the quarter, and she told us, in so many words, that the ruler is made of rubber and nobody has to use it anyway.

Her name is Hillary Slattery. She calls herself "the steward of OpenRTB," which is the specification governing every programmatic bid request on the open internet.

That's somewhere north of fifty million a second. If adtech is a highway, OpenRTB is the traffic code, and Slattery claims she writes it. On an industry livestream after the transaction ID brawl, she described the job with the serene calm of a lifeguard at a pool where nobody can be bothered to stay out of the deep end.

Then she said the quiet part into a microphone.

"It's important to note Tech Lab doesn't have enforcement power."

Sit with that for a second, because the whole issue hangs on it.

The organization that defines what a bid request is supposed to say cannot do anything to anyone who says something else. No fines. No suspensions. No naughty list. No stern letter on letterhead. What you get is a very long document, 107 pages by Slattery's count, describing how everybody would behave in a world where everybody behaved.

It's a traffic code without police, cameras or tickets. The people who follow it were going to drive the speed limit anyway. Everyone else reads it the way a teenager reads a curfew: as an opening offer in a negotiation they fully intend to win.

So what does the spec actually do? Slattery's answer is that it hands the aggrieved party "a beating stick." You wave the document at somebody and say, that's what everybody agreed to.

That is roughly as effective as waving a speed limit sign at a Dodge Charger doing ninety. It's emotionally satisfying. The Charger is in Nevada.

Before going further, it's worth knowing who's talking, because Slattery is not your standard-issue standards official.

You know the type: fleece vest, a deck with a lot of hexagons, and the ability to speak for forty minutes without leaving a fingerprint.

Slattery came up in ad ops on the sell side, at a startup that Scripps Networks Interactive bought. Then she spent five years inside WPP, ending up in GroupM's global investment group, the actual holding company layer where the money gets routed. She has trafficked ads with her own two hands, and she holds it against the people above her who haven't. Her term of endearment for them:

"Overeducated ass hats who've never trafficked an ad. I'm allergic to them."

Her agency war stories are the best argument for danger pay in advertising. In early COVID, a client wanted nothing to do with pandemic content or the World Health Organization. A junior employee dutifully added "WHO" to the keyword exclusion list, and a meaningful chunk of the English language quietly lost the ability to carry an ad. Slattery says part of her job was consoling the poor soul "sobbing at 10:00 at night." Her summary of that era of her career:

"Kind of therapist."

That's the person who now writes the rules. She has watched the rules get bent from both sides of the table, and she doesn't pretend otherwise. That makes her a great witness. It doesn't make her a neutral one. We'll come back to that.

Recap for the people who spent August at the lake. The Trade Desk's Mike O'Sullivan asked, very politely, on LinkedIn, why anyone would object to transaction IDs. Those are the little identifiers that let a buyer notice it's being offered the same impression eleven times by eleven different exchanges, like eleven used car dealers all selling you the same Camry. Then a change went into Prebid that broke those IDs across exchanges, and IAB Tech Lab called the change a violation of the OpenRTB spec.

Here's what the steward of that exact spec said about The Trade Desk's position:

"While I don't agree with the specific move of TID that Mike O'Sullivan did, it is absolutely within the Trade Desk's right to say we're not going to buy the inventory unless you have a transaction ID on it. And capitalism, baby. Let the market fall where it will. And good on them for making their expectations widely known."

Good on them. From inside the house that issued the violation notice.

That's a referee who throws the flag, marches off fifteen yards, and then tells reporters after the game that the play was perfectly legal and honestly kind of beautiful. Only one of those was the call. The other one was the press release.

Slattery describes her job with a title that will never appear on an IAB business card, which is a shame, because it's the most accurate job title in advertising:

"A good part of my role generally is being the designated asshole here, but it's for everybody. The feedback I get from a lot of the buy-side constituents is, why are you shilling for the sell side? The feedback I get from the sell-side constituents is, why do you only care about what buyers say?"

Her monthly supply chain working group pulls in 75 to 150 people for an hour. Picture that call. Everyone who makes money from ambiguity is on the same Zoom as everyone who pays for it, cameras off, unmuting only to say "plus one to that." It's a peace summit where half the delegates are selling the other half their own furniture.

And here's how she knows a spec is done:

"My goal is to make every single party walk away having shed one single solitary tear. Because if either the sell side or the buy side is openly weeping, something's not balanced there."

It's a gorgeous line. It's also the operating philosophy of a divorce mediator, not a measurement standard.

A bathroom scale does not aim for equal disappointment. It tells you the number, and then you have feelings about it privately. A standard designed so everybody cries a little is designed to get signed, not to be right. When one side is shading the truth in the bid request and the other side is paying for it, splitting the tears fifty-fifty isn't balance. Balance is the side doing the lying doing the crying.

When the livestream's host pointed out that it's nearly impossible to write a spec that anticipates every possible manipulation, Slattery didn't push back. She put the whole dream down gently, like a family pet:

"Oh, girl, I let that dream die a long time ago."

The funniest thing Slattery said wasn't even about Tech Lab. It was about the holding companies, which spend every earnings call describing their proprietary, AI-powered, data-driven operating systems, usually with a slide featuring a glowing brain and the word "orchestration."

Here's the review from someone who spent five years inside one:

"Actual product discipline within an agency is actually pretty rare. A shocking amount of that stuff in my estimation is just Excel macros and prayers."

Macros and prayers is the operating system. The AI is the font. The glowing brain is a stock photo licensed through 2027.

Now set that next to the public version. VaynerMedia's VP of media, who runs its programmatic practice, described the future in a studio interview as a supply chain that's "cleaner and greener and shorter," one where "you cut out all the intermediaries." When the interviewer asked the only question that matters, whether buyers actually know where their dollars go, he said:

"We already kind of know that now."

Kind of. That's the phrase you use about your credit card balance right before you open the app, sit down, and take a moment.

He also said the daily work is pushing "the algorithms in programmatic to really be optimizing towards a CPA or a ROAS," while "last touch is still very much prevalent" and "I don't think there's a silver bullet."

No silver bullet, lots of last touch, and a supply chain we kind of understand. That's not a measurement strategy. That's a horoscope with a rate card.

Asked why the industry keeps ignoring the things Tech Lab builds, Slattery gave a one-word answer: "Hubris."

What a word. It's Greek, it's tragic, it has a chorus. It turns a boring business decision into an Aeschylus play, with ad tech CEOs flying too close to the sun on wings made of pitch decks. And best of all, nobody ever gets an invoice for hubris.

The trouble is that Slattery had already given the better answer about forty minutes earlier: "capitalism, baby." The fixes sit on the shelf because nobody in the middle of the supply chain earns an extra dime when ads get easier to identify, count and price. That isn't pride. That's gross margin with a straight face.

Tech Lab's unused standards sit in the industry's drawer like a gym membership: paid for, occasionally mentioned at parties, never once used, because using it would mean confronting the numbers. Chris Kane of Jounce Media explained the underlying rule on The ADOTAT Show when he described why made-for-advertising inventory collapsed: "This is not a moral problem, it's a math problem." Swap "math" in for "hubris" and Slattery's whole ledger of ignored specs explains itself.

Here's the twist nobody in this story planned for.

The standards body can't enforce anything. The agencies kind of know where the money goes. The publishers, as a longtime sell-side operator told the Signal & Noise podcast this year, say buyers demand transparency and give back none.

The one company in this whole saga that actually polices its own ruler is a measurement vendor.

Jounce Media told ADOTAT on the record that it vets every client announcement that cites it, and that it has made at least one client take down a marketing release and rewrite it. That's more enforcement than the institution that writes the rules says it has. The sheriff isn't the government. The sheriff is a guy with a clipboard who's worried about his brand.

It gets more interesting behind the wall. The same answer explains how a result gets to be announceable in the first place, and that should make every buyer who has ever forwarded a case study with an auditor's logo on it quietly go back and reread the fine print.

Take away the acronyms, the working groups, the three-page appendices and the Zoom calls with the cameras off, and every fix Slattery described is aimed at the same thing: bidstream lies.

A field that's supposed to hold the buyer's own ID, holding something else. A tiny floating player in the corner of a page, sold as if it were YouTube. A CTV deal that says it's premium and ran somewhere that isn't. Each fix tries to make the bid request describe what's actually being sold. And each one comes with the same footnote: we can't make you.

A publisher-side veteran gave the most damning summary of where two decades of programmatic "efficiency" have left us: "You can hand an IO to a publisher and they run your media. There's zero hops."

We built a machine that runs a trillion auctions to replace the insertion order. The gold standard for a clean supply path is now the fax machine.

How we reported this: this issue draws on recorded public remarks by Hillary Slattery of IAB Tech Lab on an industry livestream, Nathan Thomas on the Signal & Noise podcast, and VaynerMedia's programmatic lead in a studio interview, plus on-record email from Ben Epstein of Jounce Media dated August 21, 2026. None of the three speakers were interviewed by ADOTAT, quotes are lightly cleaned of transcription errors, and host claims about CTV bundling are unverified. ADOTAT has no financial relationship with any company named, and Chris Kane, Anthony Katsur and Rio Longacre have appeared on The ADOTAT Show. Tips: [email protected]Confidential tips: [email protected]