Until recently, Hollywood was competing with a mobile-first YouTube. That version is almost gone. By next year, streaming TV is projected to become the largest share of YouTube's viewing time in the U.S.

What changes when the largest share of YouTube's time, and its revenue, comes from streaming TV?

Let's break it down into 4 big questions:
1) What share of total TV time does YouTube account for?
2) How much advertising revenue does YouTube generate?
3) Is YouTube underbought relative to its share of total TV time?
4) What happens next?

Quick answer: YouTube accounts for 14% of total TV time and 28% of streaming TV time, more than any other media company.

And it is growing faster than everything around it.

YoY growth:
1) YouTube - ↑ 10%
2) Streaming TV - ↑ 8%
3) Broadcast TV - ↓ 4%
4) Cable TV - ↓ 15%

Within streaming, nobody is close.

Share of streaming TV time (Nielsen):
1) YouTube - 28%
2) Netflix - 16%
3) Fox + Roku - 11%
4) Disney - 11%
5) Amazon - 9%
6) Paramount - 4%
7) NBCUniversal - 4%
8) WarnerBros. Discovery - 3%
9) Other - 14%

Big deal: YouTube built all of that while its number one screen was still the phone. That is about to flip. By next year, streaming TV is projected to become the largest share of YouTube's viewing time in the U.S.

Share of 2027 YouTube viewing time (eMarketer):
1) Streaming TV - 44%
2) Mobile - 44%
3) Desktop/Laptop - 12%

Most of the audience is already there.

Share of YouTube users:
1) Streaming TV - 178M (70%)
2) Non-streaming TV - 76M (30%)
3) Total - 254M

Why this matters: The TV screen isn't just bigger. It is more expensive. YouTube CPMs are 170% higher on streaming TV than on mobile and desktop.

YouTube CPMs (Needham):
1) Streaming TV - $27
2) Mobile/Desktop - $10
3) Total - $17

Every hour that shifts from the phone to the TV earns YouTube much more per hour of viewing. So the time has already moved. What about the money?

Quick math on YouTube’s ad business:
1) $40B in 2025 revenue
2) $10B (24%) in the U.S.
3) $4B (40%) of U.S. was streaming TV (CTV)

Surprising: Streaming TV advertising overall is growing 27% faster than YouTube’s share.

CAGR between 2021-26:
1) CTV - ↑ 17%
2) YouTube CTV - ↑ 14%
3) Convergent TV - ↑ 1%
4) Linear TV - ↓ 5%  

So YouTube dominates the time (28%) but is not keeping pace with the money. That mismatch is the next question.

Quick answer: Most likely. A huge gap exists between YouTube’s share of time spent and ad spend.

YouTube’s streaming TV share:
1) Time spent - 28%
2) Ad spend - 12%

Good news: Money is moving faster than time, which should narrow the gap.

YoY growth:
1) Total TV time - ↑ 10%
2) CTV ad revenue - ↑ 15%

If the audience has already decided YouTube is TV, why hasn't the money followed?

Quote from Kirby Grines - Founder and CEO @ The Streaming Wars:
“So if the audience already decided this, why is the debate still happening? Because the arguments against YouTube being TV are almost never about consumer behavior. They’re about compensation structures, political turf, and institutional muscle memory. Listen closely when someone insists YouTube isn’t TV. They’ll say it’s not premium enough, not brand-safe enough, not structured enough, not polished enough. What they’re really saying is that their job, their budget, or their authority makes a lot more sense if the definition of TV stays frozen in 2011.

There’s a particular flavor of denial that happens when someone’s professional identity is tied to GRPs, upfront negotiations, and a worldview where a “television network” is the fixed center of the media universe. If YouTube becomes TV, then linear becomes something else. And if linear becomes something else, the people who built careers around that system have to rethink everything from their talking points to their rate cards. No one is excited about that kind of existential spring cleaning. So instead they argue semantics as if language can somehow win an argument that audience behavior already settled.”

Quick answer: YouTube stops being cheap, and TV budgets stop pretending it's not TV.

Bottom line: Hollywood spent two decades treating YouTube like a phone app that leaked onto the TV. Next year, TV becomes YouTube's home field. The question is no longer whether YouTube is TV. It's whether anyone else can afford to compete with a TV network that gets its content for free.