Any specific reason why they’ve decided to do that?

EDIT: Seems like their instance is heavily moderated and they are de-federating from any instance that has communities they are not a fan of. With lemmy.world being so big, I’m not surprised we’re part of the axe. Honestly, if you’re part of beehaw and want to connect to the wider lemmy fediverse, it looks like you’d have to leave that instance.