Over a decade ago, I already saw a music festival using Bluetooth tracking to monitor crowd movements [0]. There's an assumption that people just leave their Bl

Over a decade ago, I already saw a music festival using Bluetooth tracking to monitor crowd movements [0]. There's an assumption that people just leave their Bluetooth on out of convenience. [0] https://actu.epfl.ch/news/using-bluetooth-to-track-crowds-at-the-paleo-music/ https://actu.epfl.ch/news/using-bluetooth-to-track-crowds-at...