Adsense revenue is driven by purchase intent. "LA to Chicago flights" is a goldmine for advertisers. "Johnny posts a lot of movie reviews so let's target him

Adsense revenue is driven by purchase intent. "LA to Chicago flights" is a goldmine for advertisers. "Johnny posts a lot of movie reviews so let's target him a Netflix ad" is nice but it's no where near the same as a direct search with intent to purchase.