Over on Bluesky nostr:npub1fy2xgqjdsxywrhvwwduygr422mr95tc6lp6l5fu080a6pqpdxk7sqr8u8z pointed out this interesting analysis of AT Protocol (not all positive) from back in November... from someone who now (well after writing that) works for Bluesky. It's worth reading if you're trying to understand the differences between ActivityPub and AT Protocol. https://bnewbold.net/2022/atproto_thoughts/