I don’t care if I have to see unobtrusive ads (not overlays, not popups, not unskippable videos) ads help keep many web services free, sometimes I even find it helpful when ads are relevant to my recent searches or the page I am looking at. But having companies build up profiles about me and then share that between themselves is bullshit, that kind of behavior would be treated as stalking if done by an individual, why is it ok for a business?