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You already can use LLMs that are 100% on device and private on desktop. So I have no doubts that will be an issue on Android. It just isn't computationally there yet on phones. And the whole infrastructure around it doesn't exist yet.
So I personally don't worry about the "actually private" part - more about the other parts
stackers have outlawed this. turn on wild west mode in your /settings to see outlawed content.