Right but the advertising budgets for things actually related to articles or other media content are vastly dwarfed by the advertising budgets for unrelated things that actually make more revenue/profit.
So you'll end up having to try to monetize something that has little no no related things that are profitable to advertise.
Is it really worse than "this article is about X, Y is related, let's show some ads for Y"?
I bet from the point of view of the advertisement middlemen it is not. Because they capitalize mostly on showing ads of products that people already decided to buy or are very near deciding. But that is yet another racquet that only decreases the value of the industry. My question is, from the point of view of the real advertisers (the ones selling something), is it really worse?