For those people still wondering why most of us are blocking ads everywhere with no doubt or remorse:

"Customs and Border Protection (CBP) bought data from the online advertising ecosystem to track peoples’ precise movements over time, in a process that often involves siphoning data from ordinary apps like video games, dating services, and fitness trackers, according to an internal Department of Homeland Security (DHS) document obtained by 404 Media."

Lack of privacy can cost you your work, your home, even your family. Let that sink.

https://www.404media.co/cbp-tapped-into-the-online-advertising-ecosystem-to-track-peoples-movements/