I view the bigger issue as Meta is hostile towards humanity’s privacy and freedom, and Mastodon leadership view Meta joining the Fediverse as an unqualified win. Meanwhile, I don’t think Meta is interested in ActivityPub as a protocol to make Instagram Threads more appealing, I think they’re overall much more interested in what data the can gain, and sell, analyzing the interactions between their own user pool and the rest of the fediverse that user pool interacts with.