My local grocery store from the Safeway family of stores has Bluetooth beacons that crashed my old phone. Now I turn my phone off as I have to assume these are to track where I am in the store and for how long so they can further target their ads.
Actually downloading their app is 100% a no from me. I'm moving to local stores wherever possible because I can afford it, and to be honest, the grocers raised their prices so much, only certain items are more expensive bought local.