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 communities you like, are shielded by those OSS terms: if Meta does something to the tech that the communities don’t like, they’re free to show Meta the finger. The tech is not, and can never be, controlled by Meta; the communities are not, and can never be, bound by Meta.
Meanwhile, having a company like Meta collaborate on developing and testing the tech, is something positive.