If you are taking about OnlyFans:

The writer also noted that the "grift" violates OnlyFans' rule that stipulates all accounts must be run by verified humans.

https://www.msn.com/en-us/technology/artificial-intelligence/maga-men-swindled-by-ai-model/ar-AA1Yvein

From: https://lemmy.world/post/44246810/22660472

No idea if they have a policy against it officially, but I doubt it. It would have to be a policy about AI generation specifically since successful OF "users" are definitely going to be registered companies for tax and organization reasons, either with the model directly controlling it or as a business group like traditional porn licensing content. So the content wouldn't match the "user" in those cases. Fake names are pretty standard for anything remotely close to adult for safety reasons as well.

OF wasn't originally created for adult content, it was originally intended to be very general. Tons of bands and similar had OF accounts before it ended up focusing on adult content, many still do because it is a good service setup for exclusive content like that. They were just the platform that didn't cave and crackdown on adult content like other similar services when threatened by payment processors, so all the users went there as it was banned elsewhere.