The whole point of the fediverse is that there is no “right” or “default” server.

If you think “Lemmy.ml” is misleading people into thinking that the server is official, what about “Lemmy.ca”? Or “Lemmy.pt”? There are plenty of instances that follow the same format. Same with mastodon.social, run by the devs, and the countless other mastodon.* domains.