Banning everyone takes a bot, which is rate limited. Same with a trash flood.

Automod though, you can easily set to do things like remove all new comments and submissions, remove stuff on one report (which lets you use the argument no one really believes that you’re letting the users have more control.), allow new submissions but lock every comment section, or allow only select users to post, whether based on karma, username, flair, etc.

Possibilities are endless really.