What I never understand: why try to track me and try to understand me when all that is needed is to chose ads within the context of the page where the ad is dis

What I never understand: why try to track me and try to understand me when all that is needed is to chose ads within the context of the page where the ad is displayed? There is a reason I am visiting a certain page. Targeted tracking _never_ works for me. These ad are simply wasted. Targeted ads are snakeoil. I get to see useless stuff. And it gets so annoying if you only see the same ads for weeks or months (I dont care about IBM products!!!11). That‘s one reason, I bought ad blockers for my mobile devices, too. Edit: I know one reason: the ad industry has to reinvent itself in order to sell. To provide useful ads to ‚endusers‘ is just a lie!