Or just ban this kind of data collection. Is there any reason anyone would willingly click "Accept" when a website asks to share your data with 500+ partner sites?
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Targeted ads generally bring in 3x the revenue of generic ads. Personally speaking, I'd rather have 1/3rd the ads on a page and allow my data to be tracked. I don't mind my data being tracked, and I'd rather see ads for keyboards / mens clothes (what I buy) than diapers / ladies shoes (who knows what tomorrow holds, but this is not what I'm buying at the moment).