
Ad tech’s data train: a sprawling cookie ecosystem fuels AI training
The Register exposes a sprawling network of ad-tech vendors whose cookie and non-cookie trackers collect vast user data—IP addresses, device identifiers, location (precise and non-precise), profiles, and browsing activity—often for long durations and sometimes under legitimate-interest justifications. The piece highlights how this data ecosystem, plus storage beyond cookies, could be used to train AI models and influence ad targeting, raising privacy concerns over how much online activity is captured and stored across dozens of vendors.












