Continuing the story, lets say we have a company and I'll make up another name for them: Scroogle. Scroogle operates a popular website and collects your location whenever your phone connects to the website. Scroogle does not sell this data to the USG.
Which company is complicit in the widespread sale of data? Perizon has it's own data ingest system separate from Scroogles. It's always been separate and it's been operating for decades; Scroogle is not complicit in Perizon's decisions.
--
Now, there is certainly an arguement that Scroogle shouldn't collect all the data it does. But lets be calling a Spade a Spade here; Perizon is the company that fits your description.
How do I know? I briefly worked for a company that enabled this. I didn’t stay.
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