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Nielsen says YouTube is the most-watched thing on American television, a record 14.2% of all TV time in July. That number leaves out YouTube TV, which Omdia expects to become the country's largest pay-TV operator by 2027. Its hours count as broadcast and cable. Google is about to own the biggest streamer and the biggest cable bundle in America, and no free scoreboard adds the two together.

Last week, Unmeasured took apart Comscore's new Score Report, which says linear TV holds 77.7% of measured TV ad time. We noted the rule that credits ads seen on YouTube TV, Sling and Hulu Live to the network that aired them. This week: who that rule actually helps, and why the same hour of YouTube TV is television for some ads and streaming for others.

Start with the rule itself. Since the February 2023 interval, Nielsen's Gauge has excluded live channels watched through virtual pay-TV apps from streaming and credited them to broadcast and cable. The YouTube line in the Gauge is "YouTube Main" only: creators, music, podcasts, the free stuff. Comscore's FAQ does the same with ads: an NBC spot watched on YouTube TV counts as NBC.

So the scoreboards don't pad streaming with YouTube TV. They do the opposite. They keep the internet's biggest cable company inside cable.

The last time Nielsen showed that viewing as its own slice, in November 2022, linear channels streamed through virtual and cable-company apps made up 5.8% of all television, when broadcast and cable together held 57.5%. By Unmeasured's arithmetic, that's roughly a tenth of all linear viewing already arriving over the internet, three years ago. YouTube TV has added subscribers every year since. Then the slice came off the chart, and nobody has printed it since.

Frank Kowalczyk: Nineteen eighty-five, A.C. Nielsen, they told me a cable box was cable. Two thousand twenty-six, a cable box is an app on a Roku, and it's still cable. The only thing that never changes is what we call it. The boat's in the garage, so it's a garage. I asked my wife. She says it's a boat.

Here's what happens to the ads inside a single hour of cable news on YouTube TV, according to iSpot's approach as laid out to Unmeasured.

The network's ads. A national spot bought on, say, HGTV or inside a CBS NFL game is baked into the feed every distributor receives. When it plays on YouTube TV, iSpot's smart-TV ACR fingerprints it, matches it to the network's national schedule and logs it as a national linear airing. It gets linear reach and GRP credit. It is television.

The distributor's ads. Cable networks hand roughly two minutes an hour of local avails back to the distributor. Comcast fills them from a headend. YouTube TV, Sling and Hulu Live fill them by dynamic ad insertion, a different ad for each household in the same two minutes. ACR can't follow that, so iSpot counts those spots from ad server logs and DSP feeds like The Trade Desk and Google's DV360. They are CTV impressions. They are streaming.

Linear runs about 12 to 16 minutes of ads an hour, per Wurl. Take two of those minutes out and, by Unmeasured's rough arithmetic, one ad minute in seven or eight on a YouTube TV hour gets counted as streaming. The rest is television.

Same screen. Same couch. Same remote. The network's ads are TV. Google's ads are streaming.

iSpot was asked to confirm this account on Monday. Its answer will run in full.

Frank Kowalczyk: Fourteen minutes of commercials and two of them are a different medium. At Arbitron we called that a format change. At my house we call it my brother-in-law telling the same story at Thanksgiving with a new ending.

Nielsen, Comscore, iSpot and VideoAmp all measure YouTube TV. They all run on one test, and it isn't the one buyers think.

Below the line: the one rule every vendor shares, why watching the channel isn't seeing the ad, how YouTube TV makes Disney bigger on Nielsen's chart, and the three numbers no scoreboard will print before the 2027 upfront.

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