It might be possible, were it not for the fact that the advertising industry has their customers so convinced that the stalking they do is truly effective compa

It might be possible, were it not for the fact that the advertising industry has their customers so convinced that the stalking they do is truly effective compared to a mix of scatter-gun approaches and simply advertising in relevant places. No one will buy advertising services from a company that says “yeah, we don't do that thing that everyone else says is essential”. It doesn't actually have to be effective, those buying advertising services just have to be somewhat convinced that it might be. (I'm separating the ethical matters in advertising from those in selling here, even if spreading awareness through advertising was made less unethical by removing the stalking and other irritations, that still leaves a lot of room for unethical sales techniques)