Comment by ChuckMcM

Oh its a lot more sinister than that, and its already here. An app I tried to run on my Android phone would run a video ad before it started, it used the front facing camera to determine if someone was looking at the phone. I looked away and started typing on my laptop and the ad paused, I looked back and it restarted, I looked away and the ad paused. I looked back and deleted the App.