I’m curious if the mods of these indefinite blackout subs could purge the subreddit of all posts and comments before they get taken over. Sure, Reddit can probably undo that with time, but it costs man hours.
If nothing else it would spin-up their servers something awful, they'd probably need to implement something like cloudflare to stop the API calls by whatever bot service was used to delete everything--which would just advance their plan. They could just close the API early, and blame it on "bot abuse by angry mods".