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Re:DuckDuckGo Tests How Much People Care About Privacy by cameronbrown on Tuesday July 16, 2019 @03:29AM (#20448160)
A simpler explanation is both devices have location services on, or are on the same WiFi network (same SSID).
Re:DuckDuckGo Tests How Much People Care About Privacy by zaarn on Tuesday July 16, 2019 @08:51AM (#20449521)
Criteo's framework relies on Bluetooth more than Wifi IIRC. They love telling you about how accurate their bluetooth beacons are.