Major firms that switched from outsourced “personalized” ads (ad networks w/ retargeting) to selling ads against content, found their ad revenue go up, and their advertisers found conversions go up.
Turns out that 50 years of advertising industry had gotten pretty good at tailoring ad messaging and placement to content for moving product — much stronger than endlessly showing people ads for a product they just searched and already purchased.
An example, I visit Amazon and my recommendations for the "buy it again" section are all very expensive networking equipment that I literally just ordered from Amazon to build out a new home network. There aren't any recommendations for consumables, like the box of exam gloves, hair gel, or the windshield wiper fluid tablets that I purchased in the last 6 months.