Essentially, from my understanding, there was a data leak they never commented on, they instituted a poorly made content filter without saying anything. The filter frequently has false positives and negatives, someone discovered they trained the game using content the filter was designed to block, meaning the ai itself would frequently output filter triggering stuff, more people found out their private unpublished stories were being read by third parties after a job ad and the stories were posted on 4Chan, people recognized stories they wrote that had triggered the filter that were posted, and then they started instituting no warning bans.

I might have missed something, but that's the gist of it.