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heck, they could even tell by sniffing wifi traffic

location + time + song = exact match

Of course, you'd have to trust Shazam to provide accurate data.

I wonder how many people actually end up connecting to the store wifi.

I think they could just get your MAC address if you have your WiFi turned on, without you actually connecting.

iOS doesn’t allow this any longer.

Or you install a DAS in the store and monitor the traffic of phones connected to that.