A simple #ActivityPub <-> #Bluesky interop MVP I don’t see mentioned a lot is the ability to fully oEmbed an apub/atproto post on its opposite platform. This would allow for a kind of quote-posting across networks.
If that could somehow be combined with a WebMention to inform me that my apub post has been shared elsewhere and vice versa, we’d have significantly greater cross-border connectivity than the status quo.
A Bluesky dev has responded with interest:
https://github.com/bluesky-social/atproto/discussions/1716#discussioncomment-7261438