AT&T’s WarnerMedia Ad-Tracking Plan Sparks Consumer Fears

The Verge: Regardless of how a consumer sees, for example, a car ad, AT&T can use geolocation data from your phone to see if you went to a dealership and possibly use data from the automaker to see if you signed up for a test-drive —and then tell the automaker, “Here’s the specific ROI on that advertising.”