silverpill

You can find some interoperability data here: https://funfedi.dev/support/_tables/

More applications could be added, there are open issues for PeerTube and Lemmy.

The main advantage is efficiency. You don’t need to poll 1000 servers every minute to get fresh content because everything is delivered straight to your inbox.

the cost of broad redundancy of content and authorship issues

ActivityPub doesn’t have redundancy or authorship issues. An object only exists on the originating sever, other servers merely cache it. This is not different from what RSS readers do, for example.

FEP-ef61: Portable Objects describes how to use DIDs with ActivityPub. Here’s a slightly less technical introduction: https://codeberg.org/ap-next/ap-next/src/branch/main/nomadpub.md

It’s not easy, though. Adding this feature to an existing project will require a lot of work, especially if you don’t want to share signing keys with servers. This was discussed in #3100, Lemmy devs are not opposed to FEP-ef61, but they don’t plan to work on it.

Also, I don’t recommend copying solutions from ATProto, their did:plc and did:web are not really “decentralized”.