Hilariously, a subreddit that I mod, with less than 700 subscribers and like, 4 slightly active users (3 of whom are mods), just got the threatening modmail. We only went private as a gesture of solidarity, there's maybe one post a week so it's not exactly a bustling community. I'd made the sub public for about an hour every couple of days in an effort to avoid this sort of thing, guess it didn't work.