Digital Identity
When you turn on the setting in your browser that says “Do Not Track”, you probably expect to no longer be tracked on most websites you visit. Right? Well, you would be wrong. But don’t worry, you’re not alone.
Extract from : https://spreadprivacy.com/do-not-track-act-2019/
Students have worked about this subject with Lightbeam.
Lightbeam is a Firefox add-on that enables you to see the first and third party sites you interact with on the Web. Using interactive visualizations, Lightbeam shows you the relationships between these third parties and the sites you visit.
https://addons.mozilla.org/en-US/firefox/addon/lightbeam/
Paco, Mathieu and Baptiste have carryout this experiment on many websites :