+ Signal, WhatsApp, Telegram and Vider cannot be used w/o phone number (or, in some cases, even without a working phone), which makes them all not trustworthy.

+ Signal, WhatsApp, Telegram and Vider cannot be used w/o phone number (or, in some cases, even without a working phone), which makes them all not trustworthy. I can only vote for Matrix/Riot once again.