Having criticised BlueSky a *lot* over the past few months, I do want to flag a couple of things that make it qualitatively different from Titter. At least for now.
1) their entire stack is Free Code, and their protocol is documented.
Christine's analysis suggests that doesn't help as much for potential self-hosting as it might. But it remains true that a well-funded organisation could stand up a complete replacement of BS, using their code.
Not true of Titter.
(1/?)