Modlog, which includes a site ban—something only admins can do.
The community bans also include communities that aren’t moderated by any instance admins, and some that are only moderated by a single person who likely isn’t aware of actions taken under their community’s name.
Oh, I wasn’t the one who was banned. I’m here to call out questionable use of moderation powers by the lemmy.ml admins. If the admin felt that the user violated instance rules, the recourse was to issue a site ban—which they did. Throwing in 20 community bans after that for the same time frame is petty and unnecessary.