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