OnlyFans and other sites were in violation of these rules for very long time.
Edit: fix typo
I think the big problem is actually with fairly recent changes in how the rules are applied (and maybe to the rules themselves, not just application) to intermediate distributors between the producer and the consumer which has caused existing sites to have compliance issues.
Pornhub is, from what I understand, very much not doing fine. For reasons directly related to the same kind of verification issues.
No it doesn't. They "verify" users to upload, but they aren't necessarily verifying every second of content they upload. Which is why the site STILL has copyrighted content (e.g. animated hentai) uploaded.