Signal works perfectly in my use case, my friends and family happily switched over to it where when I tried to help my parents set up Matrix it was super verbose and required them to remember long passwords, etc. (of course they shoul dbe using a password manager, but one step at a time!).
They are encrypted with a key you have to note down somewhere though, so if you don't prepare for it the messages are, in fact, gone forever.
I regret getting friends and family to use signal.
F, for Failure
