~ personal opinion ~
That’s a bit disappointing. I was sort of hoping this would immediately kill off Twitter, but without the EU that’s not gonna happen. Hopefully they open federation pretty soon after launch so then at least EU can participate from Mastodon.
I don’t get why this is blocked though, given Instagram is available in the EU. I guess the development timeline hasn’t allowed enough time to ensure it complies with the specificities of each region and their respective users.