The Religious Right? Nicholas Kristof of the NYT, is probably the most powerful individual sex censor - the guy singlehandedly got Pornhub financially de-platformed!
Not seeing that there is a difference between content intended for public distribution and content that is not is arguably part of the problem here. (Or, even worse, considering someone having sex and someone being raped to be morally equivalent.)
Meta/FB/Insta/Whatsapp/Messenger were & are responsible for facilitating significantly more of all of the above terrible things. Of course the problem was sex and that they are a vice company, it made them an easy moral outrage target.
I'm not denying that being a porn company made it easier, but let's not compare what was going on there to what goes on in the private messages of nearly any website large enough.