* Total fantasy to think you wouldn't fall afoul of free speech, both legally (in the US) and morally.
In fact, the author touts as a benefit that you'd stop populists being able to talk to their audience. This is destroying the village of liberal democracy in order to save it!
* Absolutely zero thought has been given to how to police the boundaries. Giving a paid speech? Free gifts for influencers? Rewards for signing up a friend?
* Products need marketing. You don't just magically know what to buy. Advertising fulfils an important social role. Yes, I know it can be annoying/intrusive/creepy. "In our information-saturated world, ads manipulate, but they don't inform" is an evidence-free assertion.
* Banning billboards or other public advertising? Fine. Not new. Done all over the place for commonsensical reasons.
* Any article that talks about "blurry, “out-of-focus fascism”—that sense of discomfort that you feel but can't quite point out" is itself blurry and out-of focus, not to say absurd and hyperbolic. Calling a mild sense of psychological discomfort "fascism" is just embarrassing.
Any existing policy inevitably has a gray area, no matter how elaborate it is. That's okay if the author didn't cover corner cases in a short essay.
> You don't just magically know what to buy.
Knowing what you need is not magic. I don't remember much advertising lately that would tell me how a good can satisfy my existing needs. Mostly, they are trying to make me feel I need something I didn't need before
Knowing what you need is not magic, but knowing which products might satisfy it is not automatic. Advertising targeting, which people quite reasonably find intrusive, exists because advertisers desperately want to find people who may potentially want to buy their product.