For everyone, because of marketing. "Go check out mastodon.eu*" works much better than "You know, there is this great mastodon-thing, go search for it, and then find an instance that suits you..."
It's too complicated đ
Once people are in and look around and realize what's what, then they'll (possibly) seek another instances. And they should, since multiple instances is sort of the whole point.
[* or whatnot 𤥠]
