[dsnr]

This, and also the power of tracking comes from being able to share data/track across domains. So the best way to mitigate this is not to dumb down our browsers but to fight cross domain access to this data. This can be done either by regulation (see GDPR) or technical measures (disabling cross-site scripting, cookies etc)

[zelphirkalt]

They can simply exchange the data server side, no?

[dsnr]

In theory yes, but they can't use the data for legitimate business while also complying with the regulations.