I thought that kind of tracking was illegal: https://www.ftc.gov/news-events/press-releases/2015/04/retail-tracking-firm-settles-ftc-charges-it-misled-consumer

I thought that kind of tracking was illegal: https://www.ftc.gov/news-events/press-releases/2015/04/retail-tracking-firm-settles-ftc-charges-it-misled-consumers https://www.ftc.gov/news-events/press-releases/2015/04/retai... maybe it's ok as long as it's anonymous.