Who manages this, and who defines the criteria?
That's exactly the kind of thing the Lemmy community needs to figure out together. There doesn't have to be just one, but there should only be a handful, and they should work basically the same way. Ideally some consortium or committee would come together to agree on a simplified protocol for onboarding. I realize that's easier said than done in the early, Wild West days of Lemmy. But if the Fediverse is going to take off and undermine the billionaire-run social media networks, it needs to be easy enough for your grandma to understand it, and be able to sign up and get around without getting lost of confused.
Very much agree with this. Multiple onboarding instances that all work basically the same way, routing new users to them based on geography and language to start, and maybe when the sign-up in complete, the first post they see is an automated very basic primer that includes something about that Lemmy isn't owned by anyone, let alone by a giant corporation that wants to collect and sell their identity.