depends on how hard Onlyfans works to prevent fake signups? You have to do face verification with an ID in order to make an account, and the photos you post must match the uploaded ID. Can prob be gamed but probably not en masse.
You found the main issue point. You have to be a real person to create an account - this AI nonsense won’t take off as predicted.
Consumers will notice the scam as they already do when someone else is running the profile of an OF creator.
You grossly underestimate the almost certain future capabilities of AI; not that it matters. It's probable that if OF blocks fake models, they'll eventually be run out of business by competing sites that don't.
Yeah it's already very difficult to verify and have your account approved as a real person. You must provide government issued ID that matches your real face scanned by a phone, and prove that you already have fans on social media sites now before they allow sign ups.