The whole point of my comment is that these platforms have never had the expectation of being a free for all. Upload a video of a penis and watch how long that lasts. And I don’t think “incites violence against actual people in the real world” is a newly banned category either.
No, I think they do have that expectation. 'Everything but porn' is a pretty widely accepted free for all category on the web. But yes, 'incites violence' is an actively illegal category; I suspect the only reason it's lasted this long is that the moderation muscles have atrophied so hard nobody seemed willing to go first in banning Jones completely.
Everything but porn, classified documents, personal information without the consent of the person, copyrighted works, encouragement of suicide... I could go on.
You can find all of these things on the web, but they are far from widely accepted.