Because there's a big risk vector on small instances if the news about FB joining federation is real. I'm already hearing speculation that Eugen (Masto guy) met with FB because FB is planning to throw money at instances like his so federating with FB will not kantoikan his servers with traffic. Speculation because with NDA signed no one is saying anything publicly.
So 1-2 punch rn, between reddit being what it is and everyone else is still getting their bearings and Zuckerberg making moves.
@Annoyed_Crabby we don't know the full details yet on how (i did share on cafe about 2 days ago what details we have like the proposed instance name) but short answer is yes. Details indicate that it's going to be a bridge for its Instagram side where it exports to a (likely) Masto instance. And Fedi accounts can follow there. And from there, well, it spiders outwards... Once they get boosted, then which instance picks it up etc. And because how masto works on the backend every change propagates down and upline. That's how u can accidentally DDoS small instances and webhosts if something gets too popular (it's happened, and that's with pre-reddit population size, lol)
Then of course, before you guys discovered the place, mastodon.social had to be silenced or defed a few times already because open signups+ popularity = spammers sending crypto DMs across Fedi lol. They had to do the same thing every time: close registration and then manually clear out the accounts (they can't afford to be cincai the way other places can once they get big; Fedi does also run a lot on reputation + if you suggest, ah then you join mastodon.social lor, sure will kena)