Bluesky managed to go offline practically entirely. I count on you folks to spork the hell out of this.
See also here.
In fairness they're still rolling out their federation.
Individuals can host their own servers with limited users (10 I think?). The Guardian seems to have launched one judging by their new account @theguadian.com launched today.
And they're using an open prptocol, with a promise to transfer it to an independent standards body in the near future. Also Jack Dorsey no longer has anything to do with it which is another good sign.