I have no doubt that out of all the websites in existence some collect your location and sell it to any bidders. My point is that if you focus on the actual ad-platforms the behavior of selling location data is not what they do. If you have a problem with people selling location data you should be focusing on people selling location data and not some nebulous "ad-tech". Perizon does not validate if you're using the location data to catch criminals, sell shoes, or find your wife to beat her to death. Even without "ad-tech" Perizon still has a financial incentive to sell your data.
come now, all of that data is much too big for a zip drive. you'd need a jazz at least