I mean what do you think they were doing for all those years? I still remember when r/subredditsimulator would frequently pop up on the front page because of some of the ridiculous and funny things the AI language models would post. But eventually over time as they learned to mimic typical user posts, it got to a point where it was a clone of every other sub on the site and everyone sort of forgot about it. So I honestly would not doubt for a second that they've spread them out to numerous subs and are using them as content creators to try and keep subs appearing active.