I know that's not particularly helpful but surely you didn't expect an actual answer to a global-scale socioeconomic issue? Personally, I would focus on breaking up centralisation. People spread ideas through networks incredibly quickly. But then there are issues of paying off "influencers", "streamers", "reviewers" to give a fake idea of authentic acceptance.
We should also be careful in the actual question. I don't think many people on HN are against the idea of "marketing" i.e. getting some information across. That why in my original comment I said 'mass marketing' and 'targeted marketing'
So your use of marketing ever only solved a problem established by marketing.
Which is good marketing for marketing, of course.
Word of mouth is probably the most powerful one. If someone you trust recommends you a specific app, that's better than any marketing campaign. Why do you think astroturfing exists?
If marketing was solely based on showing a product in an honest way and listing its properties and specifications, with no hyperbole and exaggeration, that would be something else. When was the last time that sort of advertising was the norm?
Advertising used to have lots of text extolling the features and benefits of the product in question, but that's too complicated. Now it's just bright flashy colors and vague allusions to power and capability. BMW has been running an ad on Youtube for a while now about a new electric model, and the voice-over basically says "there are so many reasons why car is great, it would be impossible to list them, just trust us and buy it", they're not even pretending to tell you about the product itself.
Marketing doesn't incentivize innovation, it tries to sell you an inferior product at a higher price.
A lot of marketing is simply based on exploiting people's feelings and encouraging them to desire something they don't really need.
The fact is that we cannot get away from selling. Going for an interview - tart up your CV and sell yourself. Going on a date - sell yourself. Want to convince a jury - sell your case. Wanting to upgrade your property - sell your house. Build a product or deliver a service - sell it: even if it is genuinely the best on the market that people should know about, you have to crack open the market and you will likely have to work against resistance.
I'm willing to compromise and agree that we don't have to ban all marketing. Let's maybe just ban billboards, product placement, sponsored messages, targeted messages, and most forms of in-public advertising, and see where that gets us.
A few years ago I created a SaaS product, and as a newcomer in the market, I was happy that (online) marketing existed so that people discovered what the advantages of my tool are compared to more established products that people already knew.
My question to you marketing-haters: what exactly are your suggestions here? Let people use only what they know? This doesn't incentivise innovation. Let an ideal unbiased search engine do the magic? One can argue that it is still marketing, but in the hands of someone else.