@wjmaggos the two aren't equivalent, though.
#Bluesky / #ATProto and #ActivityPub / #Fediverse are based on fundamentally different designs particularly with regard to the role of instances, not to even mention details of protocol signaling.
It's not the case that they could simply invest here rather than there. This place has its own issues that arguably make Bluesky the more attractive path to develop.
Just because people have dedicated their lives to one particular path doesn't mean it was the right path to take.