[username223]

Maybe it's optimizing for the wrong thing. Maybe the goal of targeted advertising is to find the people who were about to buy something anyways, shove an ad for it in front of them just in time, and take a cut[1]:

> Our results indicate that more sophisticated targeting algorithms might not gain, and might even harm, the advertiser as those seeing the ad would convert in the absence of advertising.

There are a bunch of ad-tech people on this site; maybe some of them could chime in and share how many more sales they make using total surveillance versus basic keyword-in-page.

[1] https://poseidon01.ssrn.com/delivery.php?ID=7020000840130690...