It's a simple rather heuristic approach. Because BLE uses randomised MAC and the OSSID are not stable, nor the UUID of the service announcements, you can't just scan for the bluetooth beacons. And, to make thinks even more dire, some like Meta, for instance, use proprietary Bluetooth services and UUIDs are not persistent, we can only rely on the communicated device names for now.
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Epic CEO Tim Sweeney might be one of the most outspoken people in the history of the world. He fought two of the world's most valuable and powerful companies almost all the way to the US Supreme Court, insulting them again and again: "crooked," "deceitful," "insanely sneaky," calling Android a "fake open platform," calling both companies "gangster-style businesses that will do anything they think they can get away with," telling me how Google's Project Hug was "an astonishingly corrupt effort at a massive scale."