A problem is that the two systems may have been so completely different that #BlueSky couldn't have really contributed to #ActivityPub. They were just to the core engineered with incompatible designs.
#Fediverse is centered around and bound to instances in ways that BlueSky seems to be rejecting, with BlueSky being more focused on being distributed while Fediverse is more federated.
It's like asking why the sports car maker didn't just contribute to developing a faster city bus.
They're just such different projects that there's not much to be done.
@volkris Thanks for that - it makes total sense. Things like pluggable suggestion algorithms seems big for AT Protocol and is not a concern at all for Fediverse.
Thanks for helping me to write a kinder story in my head about why they didn't work together.