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Why does the article say they got "every Android phone in the area" - are iPhones using Google Maps not going to get picked up as well?

There's a difference between always on location data/telemetry baked into android and using google msps.

Google maps is not on all the time.

IIRC, Google Maps is still opt-in (opposed to "Maps"), at least it was when I got my phone ~3 years ago