I have a friend that works in advertisement programming. Quiet ironically, "do not track" had the opposite of the intended effect. They didn't store any infor

I have a friend that works in advertisement programming. Quiet ironically, "do not track" had the opposite of the intended effect. They didn't store any information about a user, except in the case of the do not track signifier in which case they had special tracking logic to make sure they didn't include that user in their datasets and future user models.