Advertising would create value if it would only serve to connect buyers and sellers, but instead modern advertising serves to "generate demand", as you mentione

Advertising would create value if it would only serve to connect buyers and sellers, but instead modern advertising serves to "generate demand", as you mentioned. That means making you, artificially, usually using emotions and psychological tricks, spend money on something that you wouldn't and shouldn't spend money. We can thank Edward Bernays for single-handledly ruining the world.