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iOS does shuffle the MAC address in order to prevent this, doesn't it?

Yes, on top of this, applications don’t have access to a devices MAC address through CoreBluetooth, so they can’t fingerprint a device.

You can shuffle your mac but not your gsm/3g ids broadcasted in the open as per spec.

I first saw this tech, I think, 9 years ago when I first encountered a "bluetooth spam" device

Yes, except if you connect to their WiFi.

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