I left recently when the admin (not mods) banned all the non-rule-breaking subreddit communities I created in one swoop, with no notification, and refused to respond to any form of appeal or inquiry.

I later noticed several of my comments had been selectively ninja-removed with a petty political focus. After confronting multiple subreddits about the disappearance of specific comments, they all claimed they had no moderator log of it and it must have been done by Reddit admin.

I concluded that Reddit administration are likely silently involved in wide-spread manipulation of conversation, through hard to notice hiding/removal of comments.