I mean, why wouldn’t sharing sexual pictures and videos outside of the given consent by the performer be sexual abuse? If you perform in a porn video for a porn company and sign all documents, it is clear that you know and agree that the video will be sold publicly. If you send a nude to someone in private, you totally are not agreeing to be posted on the internet. OnlyFans is kind of in between - if you post something there for your subscribers, the consent is that the subscribers see the content after paying for it.