I hadn't realized how trackable cell phones were until I was experimenting on a wifi project and saw both MAC addresses and Preferred Network List of devices wi

I hadn't realized how trackable cell phones were until I was experimenting on a wifi project and saw both MAC addresses and Preferred Network List of devices within the area that had not joined my network. Cell phone wifi is a privacy nightmare. Even the most technical people don't realize this, so projects that popularize it are going to kick up huge amounts of mud. Think of how easy it is to identify "whale" clients, if not by direct tracking, then by revenue correlation (these N people were present for $N,NNN,NNN in revenue events). They're valuable to track because when they show up you want your sales people to be at their best, but a service that starts tracking those people is going to make real enemies quickly.