Consistently, every time as far as I can tell, any communication forum or forum subsection of sufficient size that is done with open invitation under pretenses of "free speech" will bring in pedophiles and nazis that will take over if nothing is done about them, no matter the original intent.
It went hard right almost immediately when Reddit banned a couple subreddits like/r/fatPeopleHate and other similarly cheerful places. At least on Lemmy we can just let those kinda servers be in their own little septic tanks.
It went offline, as do all of those platforms that only cater to one subreddit's worth of users (especially the edgy ones). But it wouldn't surprise me if the admin had three letter agencies breathing down their neck and just packed it in.
The good news is that from any given person's POV, it would be over in an instant, and nobody would suffer or even have a chance to be terrified by the knowledge of the void consuming them.