Adam Mosseri:
Second, threads posted by me and a few members of the Threads team will be available on other fediverse platforms like Mastodon starting this week. This test is a small but meaningful step towards making Threads interoperable with other apps using ActivityPub — we’re committed to doing this so that people can find community and engage with the content most relevant to them, no matter what app they use.
The hope that BlueSky has is to find the happy path between providing the useful parts of federation without confusing its uninterested users with its complications.
I hope they succeed in this, as I think that should always have been the goal and showing how it could work can only be good for the broader mission.