“When you use Signal, your data is stored in encrypted form on your devices. The only information that is stored on the Signal servers for each account is the phone number you registered with, the date and time you joined the service, and the date you last logged on.”
A really secure messaging system is worthless if it’s not used. SMS too insecure? Ok, change the UI to reflect that. Have an open lock symbol or eye. Notification reminders that it’s insecure & nudge to invite your friend to Signal.
Boomer parents using Signal & now it doesn’t support SMS? Congrats, now the app doesn’t work to message the majority of their contacts. The average user isn’t going to check if someone’s on signal, send them an invite, then wait to message until they get the app. They’ll just move to their (Android) default message app that literally works with all US phones. Congrats, now less signal users, gj .