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Re:Chrome 69 will keep Google Cookies when you tell it to de... by gcb0 on Saturday September 29, 2018 @02:15PM (#18101887)
All those companies sell the "anonymized data" to everyone. for example "ad X shown to user Y targeted on Z at time T"

And if you happen know user Y matches user earenndil in a data set you control, now you know user earenndil belongs to demographic Z.

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