"WhoTracks.me is a joint initiative of Cliqz and Ghostery. It provides structured information on tracking technologies, market structure and data-sharing on the

"WhoTracks.me is a joint initiative of Cliqz and Ghostery. It provides structured information on tracking technologies, market structure and data-sharing on the web and thus creates more transparency. On the WhoTracks.me website, interested parties will find visualized monthly tracker statistics. They are based on the evaluation of around 300 million-page loads and more than half a million websites." Considering IP-address is considered personal information it sounds like this study is based on data that was illegally collected according to GDPR.