Hubzilla (was called 'redmatrix' at the time) brought nomadic identity to the fediverse in 2012. It's still here and nomadic identity still works, though it pre-dates W3C DIDs by a number of years. There also was no AT protocol or Mastodon or ActivityPub back then. Streams, forte, mitra, and probably a few others have working implementations of portable identities using DIDs over ActivityPub today. All of these could still use a bit more work, but they all inter-operate reasonably well at this point.
In the dozen years I've been working on this, the number of people across the entire planet that have been willing to help has been around 3-4. What it would take is for a few people to learn about and explore the vast fediverse that exists outside Mastodon and lift a finger to help out.
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