@stillgreenmoss @ben @delta @besendorf FWIW both "group chats + FS" and "open protocol" are now solved by MLS ( https://datatracker.ietf.org/doc/html/rfc9420 ). I think the issue of most chat-oriented protocols is that they don't map to "email" very well, since emails are basically "fire and forget", so key exchanges are harder/slower.
@crepererum @ben @delta @besendorf this is super interesting. I didn't know about this RFC or effort. Wikipedia entry suggests it's not in use in any end user applications yet, do you know if that's true?