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.
They do. Their business model is to take out upstarts with growing popularity trends. By the time they actually get big, it’s too late.
With several organisations making the move to the fediverse, it is something they want to deal with.