I mean, it's not just a theory -- Tile uses BLE to track devices around a city: https://en.wikipedia.org/wiki/Tile_(company) https://en.wikipedia.org/wiki/Tile

I mean, it's not just a theory -- Tile uses BLE to track devices around a city: https://en.wikipedia.org/wiki/Tile_(company) https://en.wikipedia.org/wiki/Tile_(company) > The application can locate Tiles beyond the 100-foot Bluetooth range, using "crowd GPS": if an item with an attached Tile device is reported lost and comes within range of another user's Tile application, the nearby user's application will send the item's owner an anonymous update of that item's location.