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How the Signal Knockoff App TeleMessage Got Hacked in 20 Minutes
(www.wired.com)
This is a most excellent place for technology news and articles.
I'm still not confused and you're still missing the forest for the trees because you don't like the common practice of including the server infrastructure when talking about apps.
There was a plaintext archive of messages on a remote server. That's a security problem no matter what point you're trying to make about the term app.
I do like common terminology, that's the problem.
Once again, this has already been cleared up elsewhere. Since you seem intent on dragging this out for some reason, you're going to be blocked. Have a nice night.