I'm not entirely sure what you are getting at paying for sex is found in more than just Homosapiens. But that being said, there does seem something really skeevy about the fact that when you are chatting with some popular only fans model, you are probably really talking to some guy in the Philippines who is trying to up sell you to additional content.
Is that more or less depressing than an AI chatbot girlfriend? I don't know. Sure seems like we are living in a cyberpunk distopia.