> The reasons why someone might tank their site performance with a bunch of conflicting ad trackers is not just because "data is valuable". We're conditioned to

> The reasons why someone might tank their site performance with a bunch of conflicting ad trackers is not just because "data is valuable". We're conditioned to think of ad tracking as solely interest targeting[1] and remarketing[2], but a huge part of it is also just attribution. Advertising is paid for on a per-click or per-conversion basis, and nobody trusts nobody in this industry, so everything needs to be tracked or the people buying ads get gamed out of their money by the people they buy ads from.[3] So even if you just want to buy ads, you often also need to have tracking on your website purely so that the ad network can either protect you from click fraud, or if you're paying per conversion, actually track how much you owe them. Thanks. I think this is severely understated. Ad people managed to force the debate to "customized ads" vs "privacy", saying that websites could make money exclusively with customized ads. We've seen here on HN a lot of examples of people realizing that was bullshit (I would guess there are some cases where customized ads can be beneficial, but overall they seem little). Apple showed how to make attribution privacy-friendly (I have no idea whether there implementation works and scale), yet debates still manage to ignore that totally. That being said, solving attribution doesn't actually... solve attribution problem. The reason being for the case where I search Nokia D3500 on Amazon, then I go on random website, which will show me ads for Nokia D3500 on Amazon, and I click on this ad to buy what I already planned to buy. In that case, the random website will get money, with current unprivate ads, while they won't with the private one. I didn't change my consumption based on that ad, so the ad has literally 0 value, "private-friendly ad" properly reflects that, however the migration from not private to private ad will reduce the revenue for websites (even though this didn't have any impact on my purchasing behavior). Edit: It does solve attribution for "proper meaningful" ads: If I'm reading camera reviews on some websites, and they have affiliated links for those reviews, then they'll rightfully get money for it, whcih is good!