If there’s one company you should preemptively block, it’s Facebook. They have a track record of destroying anything and everything they touch and there is zero reason to think it won’t be the same this time. From this post:
They aren’t some new, bright-eyed group with no track record. They’re a borderline Machiavellian megacorporation with a long and continuing history of extremely hostile actions:
Openly and willingly taking part in political manipulation (see Cambridge Analytica)
Actively have campaigned against net neutrality and attempted to make “facebook” most of the internet for members of countries with weaker internet infra - directly contributing to their amplification of genocide (see the genocide link for info)
Using their users as non-consenting subjects to psychological experiments.
Absolutely ludicrous invasions of privacy - even if they aren’t able to do this directly to the Fediverse, it illustrates their attitude.
Even now, they’re on-record of attempting to get instance admins to do backdoor discussions and sign NDAs.