Not really. If the admins of that instance don't want to federated, that's their prerogative. They'll gain or lose users based on that decision. The beauty of the fediverse is that it's all on a voluntary basis. If beehaw decides to federate with a small cluster of other instances, then they'll have their own niche just like the current internet.
That's beehaw's problem. They defederated with lemmy.world recently
I didn't try MCC or multiplayer, since I was just performance testing on the computer (will eventually be the wife's machine after we move next month), but even running Academy with the bots was running great. I was able to sign into my Microsoft account no problem though, so I want to try multiplayer next.
But that's no different than the current internet. Like I said, it's beehaw's problem. If they want to strictly enforce native users on their instance and have their stricter account creation process to join their community, then that's no different than the current internet.