The courts already distinguish "commercial speech" as a class of speech. Would we prevent all forms of commercial speech? What about a waiter asking you "would you like to try a rosé with that dish? It pairs very well together." Is that "advertising" that would need to be outlawed?
What about giving out free samples? Is that advertising, and thus should be illegal?
What about putting a sign up on your business that says the business name? Is that advertising?
I hate advertising and propaganda. But the hard part IMO is drawing the line. Where's the line?
The line is clear: is money being exchanged in order to promote a product? That's advertising.
Someone I know mentioning a product because they want to recommend it to me? Not advertising.
Giving out "free" samples? Presumably someone is being paid to do that, so advertising.
We can later quibble about edge cases and how to handle someone putting up a sign for their business. Many countries have regulations about visual noise, so that should be considered as well.
But it's pretty easy to distinguish advertising that seeks to manipulate, and putting a stop to that. Hell, we could start by surfacing the dark data broker market and banning it altogether. That alone should remove the most egregious cases of privacy abuse.
this is obviously not a clear line. No money is exchanged when I promote my own product through my own channels, nor when I promote my friends products, whether I disclose it as promotion, or disguise it as my genuine unaffiliated opinion. Sometimes it really is a genuine opinion! Even worse: sometimes a genuine opinion becomes an incentivized one later on as someone's audience grows
the good news is there is a solution that doesn't require playing these cat & mouse games and top down authority deciding what is allowed speech: you want better ways to reach the people who want your product.
Ads are a bad solution to a genuine problem in society. They will persist as long as the problem exists. People who sell things need ways to find buyers. Solve the root problem of discernment rather than punishing everyone indiscriminately
But this is not the vast majority of 'advertising' or where advertising causes so much harm. A single individual has much less power to manipulate a single other individual, let alone thousands of other individuals. It takes millions of dollars to hire people with specialized marketing skills to do that.