[dredmorbius]

The Fediverse has a global name registry. Your instance-name is part of that.

(That is, names are globally unique. They may not always be findable, but for a sufficiently federated profile, searching from a sufficiently federated instance, that shouldn't be a hurdle. And I strongly suspect third-party directories will emerge.)

[AlchemistCamp]

The problem (other than disastrous security concerns stemming from server admins being able to read everyone's DMs) with Mastadon and similar is that once you move to another instance, your username changes.

With Farcaster, user names are both decentralized and global.

[dredmorbius]

Gotchya.

Having migrated a few times (both before and after official support for this existed), I'm aware of the Fediverse's non-portable namespace issues, and some way of resolving that would be useful.