Many people conflate marketing and advertising. They’re not the same thing.
advertising: n. The activity of attracting public attention to a product or business, as by paid announcements in the print, broadcast, or electronic media.
marketing: n. The activities required by a producer to sell his products, including advertising,
then my complaint applies. Pushing information about your product into my face is both advertising and marketing.
If you mean "marketing: n. The act or process of buying and selling in a market." then your comment is unrelated, because neither I nor the person I replied to were talking about other people trading between themselves.
For example, Hacker News is absolutely a marketing vehicle for Y Combinator. Would you say that they "intrusively steal people's limited time and attention to force my manipulative product spam right into their faces"? You choose to come here, and in doing so, it elevates the brand of Y Combinator in your mind and in the world.