[sph]

ATProto is a great idea that will never go anywhere because of its close association with Bluesky the service, and Bluesky the company, and that's a shame.

[keybits]

atproto has an active IETF Working Group: https://datatracker.ietf.org/wg/atp/about/

[prmoustache]

XMPP had one too.