Microblogging with ActivityPub

It's the only one that seems to be trying anything new w.r.t. robust moderation; Mastodon's system is reviled for its uselessness by most of the site owners I've talked to who've had to use it, and Pleroma's was written by someone who had to leave the project years ago and has had zero upkeep since. Both of the big two fail Postel's Law badly - there is no way to express “do not transact with this remote instance in any way” unless you become a domain expert at nftables and DNS RPZ chicanery, which isn't a burden I'd wish upon my worst enemy.

There's plenty other faults but the lack of access control has been an elephant in the room, so to speak, for going on half a decade.