Comment by biztos

I admit this is a factor I hadn't much considered. I'm sure at some point, if not already, the data collected by your phone will enable the equivalent of a tracking pixel on your physical location, so you can get personalized ads when you step into the subway car: the system will quickly evaluate which rider is most likely to spend money based on ads, and on what, and then an auction will be run in two nanoseconds and the winner will show their 10-second transit clip. Oof.

The saddest part is, the old kind of advertising worked just fine, before all the companies got addicted to AdCrack.