Ben Werdmuller follows up on the fediverse symbol, blogging that Meta should be commended for adopting ActivityPub before any other large network:

Whatever you think about Meta’s goals for participating, I do also think Meta’s presence gives the network a sort of legitimacy that it was otherwise struggling to achieve.

I agree. I have nitpicks with the (for now) partial rollout on Threads, but overall it’s a good thing.