It was reported that the amazing developer of #Friendica, #Hubzilla, and #Streams (to mention a few), is importing his encrypted PM/DM mechanism over to ActivityPub's latest round of discussion and development. It was something that was supposed(?) to be in AP in the beginning, but …

I'm not sure how real it is (the work), I haven't been paying attention after my own Friendica and Hubzilla instances went offline (due to lack of time to manage it). So, hopefully it is and we'll finally see encrypted PM/DM in #ActivityPub. Then we'll see if that software you mentioned is W3C compliant once the next version of AP comes out. Or, they'll choose to not to and start wrecking the #Fediverse in the process (*cough*EEE*cough*).

(P.S. He was the first who developed true account #portability years before #ATproto started to "champion" it. I think it's also being posted into the next AP version(?).)