No, most. Like Signal for example. Even without security you can't migrate between android and iphone or have multiple devices with the same account. But they have crypto amd stories now lol.
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!).
I expect it would be easier to compromise a group member's phone than someone's Google account.
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