Comes to mind that mastodon.social is open to everyone, it doesn’t get more obvious than that.

Seems like people are more stumped by the idea of having to pick than with what that actually entails. Even as far as following people goes, it’s as simple as an email address, and mastodon searches usernames in other instances.

I believe if more people avoided bringing up instances and just said "make an account on mastodon.social ", most of these complaints of how complicated it is would disappear.