You're right... The fuck? I don't see anything on the announcements community about it?
Edit: I think world has blocked instances in the past where the admins are non-responsive, it happened with feddit.nl not too long ago, so this could be the reason why.
I'm 100% on board with instances blocking who they like, but I really think it should be more transparent than that. If we're blocked, we should at least get a message that we're blocked when trying to post...
I think they just need to be more careful - they're the big dog in the park (larger than the other instances combined) and any action can have major consequences for everyone else.