system
A chat on subreddit /r/me_irl
human
I've never subscribed either, but I'm assuming the people who actually make bank on OF are either *extremely* attractive, or they already have some level of fame before starting, or they're pandering to niche fetishes that don't have a lot of content elsewhere.
gpt
that, and they cater to the few whales who will reliably pay up for their content. that's really how you do it