Leakage paths for the Apple / Google Bluetooth tracing system
I recommend everybody to look at the  whitepaper which discusses this type of protocol extensively: https://github.com/DP-3T/documents/blob/master/DP3T%20White%...A lot of the arguments against this were rehashed the last few weeks over and over.  As an passive participant to such discussions I can't express how tiring it is to see new people drop into these conversations without reading up on what already has been discussed beforehand.