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?