[themodelplumber]

Hopefully the ad tech uses the lower-acoustic-clarity method mentioned. It'll be like bus driver announcement white noise. "Wah, wah. And if you wah wah wah, visit wah wah wah dot com today."

Edit: I also wonder how it works if you modulate or otherwise moderate the interface between ear surfaces and ear-surroundings moisture, since that's apparently the resource this method needs in order to work at all. Shopping with headphones on can be a pretty nice experience IMO, and maybe it doubles as a countermeasure.