I'm going to come at this from my own ethical and moral framework, and try to explain myself well enough to allow you to either agree or clearly see where we disagree.
I've always been of the mindset that if you have a good product, shockingly little marketing is required.
Marketing creates value in an ethical way when it helps match supply to demand, and reduces search friction for mutually beneficial transactions. Those mutually beneficial transactions distribute resources in a way that increases the overall utility in a society.
Thus, ethical marketing is still useful in an economy or specific markets where searching is difficult or costly. Plenty of useful products languish on the vine, and need consumer discovery in order to succeed.
As an example, some of my favorite restaurants I've ever eaten at have been forced to throw away food when there has been insufficient dining volume to use all those ingredients. Sometimes it's happened enough that the restaurant fails as a business. And restaurants as an industry are terrible with getting their product known to the public. So there's probably some benefit there in the act of marketing, advertising, and sales for those restaurants.
If you have your own ethical guideposts on which industries produce products that suffer from that problem (good product that
insufficient people know about, where producers are struggling), maybe focusing in on those fields/industries could be productive.