>...a proliferation of individual user data across thousands of companies, typically gathered through third-party cookies. Is this really the main culprit? I g

>...a proliferation of individual user data across thousands of companies, typically gathered through third-party cookies. Is this really the main culprit? I get the impression that a lot of the tracking work has to do with server side data gathering based on ip addresses, matching web sites, shared login data, embedded pixels and probably all sorts of other clues. I would love to be wrong about this. If I am correct then "blocking third-party cookies" is mainly a feel-good marketing ploy.