Not if it works for both sides.

> It's great but also a relatively tiny minority of all content. A niche really. And even those tend have ads.

I disagree.

And even if it was true, why do you care? I mean, I watch almost only this kind of videos on YouTube - documentaries, education (learning German ATM), infotainment and there's a huge amount of it. Niche or not, there is still more than enough quality content to watch 24h/day.