I am not a coder and I am too old to master anything new, so these days I focus on Utility. What you wrote about ActivityPub I did not know before but I think I understand.

What about Zot, did you look into it? I maintain one Hubzilla node, and getting ready build another under a different DNS do document and demo its Nomadic Identity, Cloning, and Channels / Profiles features.

We positively need more protocols than just ActivityPub, and Zot has some truly useful features (to me at least).

On this note: I have no idea what happened to Lemmy.. I was under the impression they WERE creating their own protocol to mimic Reddit - they the next thing I noticed is they converted to ActivityPub! What a lost opportunity!