If you want to defeat advertising, you have to acknowledge this side, otherwise you underestimate its brilliance and role in human wellbeing and productivity. Until you can carry its strengths forward without its weaknesses, it will keep propagating as the solution with no end in sight.
Part of the deal is that they still get to work from incentives on their end. But this alone doesn't rule out your interests or even your best interests.
The subjective beauty of this is that depending on who you are, even the seminar scammer might be both obvious AND the best news you've heard all week, because you have been waiting for a specific opportunity.
BTW I really recommend watching Harrison Ford in The Mosquito Coast. There's a bit of a diamond of truth buried in the story, kind of an anti-anti-ad message that is really important to consider.