@nicfab @fluttersh @matrix @xmpp
Signal metadata is said to be better protected than in the other systems (perhaps at the cost of centralization). I think, optimal behaviour is to have signal, matrix and xmpp accounts, so that we make it easier if the other person has any...
Btw, despite of agreeing with the article i think that besisdes metadata, one cannot be sure of the whole messages as source is closed. Believing in whatsapp encryption is trusting in META words...