There was /r/SubSimulatorGPT2, but you're telling me people would PAY for that? Maybe if you tricked them - which is arguably what Reddit is doing.
Social media's always been about giving people whatever makes them come back to the site, no matter how unethical. If an army of fake fans makes me think I have an army of real fans and keep posting for attention from my fans, they will totally do that. Unless it's illegal.