Marketing is not intrinsically evil but evil marketing is incentivized by (1) the existence of marketing companies, who have to market things just to continue existing, and (2) the existence of a million and one bullshit products whose only purpose is to make money because that's how we run our economy for some daft reason, and whose existence is predicated on persuading you to buy garbage with negative utility.

More broadly, the economy is designed to drive people to get you to pay for stuff, whether it personally enhances your life or not. This intrinsically predatory motivation favors the evil over the helpful.