For those who have not seen it yet, ActivityPub co-author Christine Lemmer-Webber @cwebber has written a new thread that addresses the more recent claims that the #Bluesky AT Protocol is getting more "decentralized".
Her bottom line: "ATProto still cannot scale down and scale wide, not towards meaningful decentralization."
Here is a link to the very thoughtful and informative thread which also includes links to her other threads and essays on the topic of AT Protocol.