So does keeping the subreddit closed. The best protest is leaving. The best way to accomplish this is the show the audience where the escape door is

Also, they could just make a sock puppet account the moderator and let the sockpuppet change the closure banner. It's not me /u/spez ! It's the sockpuppet !

Also, all moderators deleting all posts (we have backups no worries), then filling the subreddit back up with millions of penis pill spam, banning all users who ever participated, and then unmodding all moderators and finally all moderators deleted all their posts and comments and their account.

Now that is a proper protest !