If I built an uncensorable distributed/federated FLOSS Facebook equivalent (fedbook?) with distributed moderation (personalized so it censors out the things that would offend you/spam from your feed, or whatever you set it to) and it became popular, would you be for that?
Do you think it that Hateful Ideas wouldn't be compelling on such a market?
Would you deny facebook to everyone if you could, because the shape of facebook-like sites is corrosive to the mind in and of itself, in a way that private chatrooms aren't? I could respect wanting to deplatform absolutely everyone, in a unabomber way. But somehow I doubt that's your position.
I just don't see how whatever advantages you claim facebook has given to 'assholes', it hasn't given to e.g. BLM twice over- with feeds tuned to engagement and rage etc. and also the Official Blessing.