The reality is that OnlyFans wasn't the first to try this model. You have to give them credit for successfully building the business, especially with several close calls between them and government regulations.
Otherwise, paid porn was already on the downswing due to the rise of free tube sites. Onlyfans somehow got men paying for porn again.
When you can combine that experience with AI generated content, you will create something that I don't think anyone fully understands the ramifications of yet.