On version 0.19 you can block instances so that you don’t see any posts from that instance, instead of having to block communities one by one, you still see comments from users of that instance in other posts so it isn’t completely blocking the instance.
At the most basic, Facebook (they changed to Meta as a PR thingy, mostly) thrives on being a closed broker extracting from the open world. It is not that I predict they will break things here, it is that they have consistently demonstrated that is their only way of making profits. It all starts nice and smooth. Until it isn’t.