Youtube is like that big commercial avenue in the city, where you can only see mainstream stuff. If you look for the bookstore that has hacking/engineering/pyscology books, you'll have to go elsewhere. But it has always been this way.
YouTube did not become popular with "mainstream stuff" if I wanted "mainstream stuff" I would still be a cable TV Subscriber
YouTube promoting only "mainstream stuff" like CBS, and CNN will kill YouTube
I have never once watched a mainstream TV show or Movie on the platform.
Given CNN'S dwindling ratings I sincerely doubt that. If anything youtube needs to rescue them.
Pornhub has good enough porn, can find something for most any niche.
Soon you’ll find though, if you’re really into this or that, individual studios that cater to your niche create videos with high production value that are all around better than what you dig up on pornhub.
There are marketplaces for small studios like clips4sale.com (nsfw).
Also aggregators for specific niches / topics, etc.
Maybe anti-YouTube people can look to porn for the way out?