I believe the GP is saying that in their language, they're getting advertisements for over-the-counter cancer "treatments".
Sure, if everyone is smart, well-educated, rational, and has access to affordable licensed doctors, there isn't much harm in such garbage advertising. However, the problem is that these advertisements are being displayed to people who live in the real world.
The Doctors are being privately lobbied behind the scenes. Then the patient comes in with the idea for the drug. A preemptive match is already made in heaven. It's capitalizing and profiteering off medical conditions. What they do to Doctors is probably far worse than their idiotic ads warning you of sudden heart failure, stroke, etc.
Sure, if everyone is smart, well-educated, rational, and has access to affordable licensed doctors, there isn't much harm in such garbage advertising. However, the problem is that these advertisements are being displayed to people who live in the real world.