And there are hacks to make other components work as antennas, so there it is again, the dependency on a clean firmware. But the range without a dedicated radio chip is considerably less, reducing the risk in theory for many users.
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Yes, that too. You can use Rpis pin to transmit FM radio for instance. Which gives me crazy idea: if you transmitted a fake ad "call <number> and say <seed> to win 1M dollars" how many people could hear it and would call?