Kind of like drug cartels having the agenda of producing drugs that human nature has a high propensity to be drawn to?

In the face of hyperstimuli, we can't talk about mere human propensities as a justification, else we would have already turned ourselves into junkies many times over.

How many years did it take for heroin go from a cough medicine to a schedule I drug? Amphetamines, cigarettes etc.

There is a reason you can't put simply everything on the marketplace, and that is OK. That doesn't mean the idea of a marketplace is broken.

Alternatively, it simply makes it easier to click on the presented content than to purposely seek out other content. Front pages and headlines dominate media for a reason.

That's an assumption which critics of these algorithms would disagree with.