Good interview at Platformer with Eugen Rochko. Some of his thoughts on AT Protocol:

My hope still is that — fingers crossed — when Meta starts federating with Mastodon that the critical mass will be large enough that Bluesky developers will just say, okay, fine. Maybe that W3C approved standard protocol is the way to go instead of making our own custom stuff. Even if it doesn’t happen out the gate, maybe it will still start making sense for them someday.

Because Threads is opt-in for the fediverse and Bluesky keeps growing, ActivityPub might not end up dwarfing AT Proto the way we expected.