@ramsey
We have a rule on our server that registration is allowed if you're using one of three languages which moderators of the server can speak.

It doesn't allow us to make a large international server, but it allows us to process everything in a timely manner and stay connected with our users.

This is not an universal rule every server can use.
But I also don't think that it's too bad because having more servers in different location is more beneficial for Fediverse than having several very large servers.