Imagine that the government or some other agency can track your every move. What are the gogo bars, other bars, massage shops you visit, and how long you spend there. Fanciful? It's already happening in one city in The Netherlands:

"In the eastern city of Enschede, city traffic sensors pick up your phone’s wifi signal even if you are not connected to the wifi network. The trackers register your MAC address, the unique network card number in a smartphone. The city council wants to know how often people visit Enschede, and what their routes and preferred spots are."

https://www.theguardian.com/cities/2...dhoven-utrecht