as far as I know (correct me if I am wrong) nostrdms + vpn: who writes who and how much = known to everyone pseudonymously, what is writen= unknown simplex: who writes who and how much= unknown, what is writen= unknown whatsapp, twitter, email: all = known to elon, zuck, bill etc and their superiors signal: who writes who and how much = known to signal + gov, what is writen= unknown element/matrix+vpn: who writes who and how much = known to serverhosts (+ gov) pseudonymously, what is writen= unknown