* 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.
It's worse than that in that it's just plainly wrong. I learn about useful products via advertising all the time -- so often, in fact, that I'm sort of bewildered that anybody could claim otherwise. We must be experiencing the world quite differently.