Actually I still think meta doing activity pub would be overall a good thing and a win for all of us. Users should decide what will be the best platform for them to use, free from any content locking reasons.
Meta being able to create completely new social network overnight and still getting more users then entire Fendiverse without the need to open up anything... That feels more like a loose for me.
But this is a very unpopular opinion here.
Yes by making it like a one-click Join from their other very popular platform "Instagram" and advertising it there.
That's (most probably) why threads is currently not available in the EU. Gatekeeper practices like this would be illegal with the Digital Markets Act. But honestly it would be very easy to get around this. Just make it possible to join without an Instagram account. So I guess there are more concerns from Meta to not fullfil EU Standards than just this.
Sooo I guess EU finally did a good job here.