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A comment on Ask HN: How prevalent is non-cookie-based web tracking today?. Parent comment

Re:Ask HN: How prevalent is non-cookie-based web tracking to... by alexbanks on Sunday November 03, 2019 @11:32AM (#21434819)
People forget (or just never knew) that tracking and ad-serving isn't necessarily about giving every screenviewer the best possible ads you can all the time. Inventory and return on ad spend are both big factors in determining where to spend. The tracking enables ad placement companies to know that even with the best possible ad (which cost inventory to place), specific users just will not engage. And if that's true, why spend that ad on that person?
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Re:Ask HN: How prevalent is non-cookie-based web tracking to... by Joe8Bit on Sunday November 03, 2019 @04:19PM (#21436680)
There’s a whole chain of companies who have financial incentives to maximise spend through their platforms. They’ll place creatives in ad units with impressions they know are low quality based on needing to fulfil fill rates and volume.

It’s pretty shitty and unethical, but welcome to to add tech!

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