Bluesky just had to go and make their own federation protocol when ActivityPub was standardized years ago for federation.
Remember even large corporations standardising on truly open protocols can be reversed after whatever the situation leading up to it is resolved.
I just remember Jabber/XMPP federation which included Google. Once Google decided they got big enough, they abandoned it. Of course nothing happened to the protocol itself, it is well and alive both on Fortune 500 and selected as official choice for presence protocol on internet2.edu