Take HN - arguably this whole forum is an ad for YC. Would this fall under your definition?
That definition pretty much boils down to every interaction between businesses and individuals, ever. Any kind of negotiating or sales or communication..
I know this first hand, I built these systems. The end state is to know and predict everything you do, and then sell you something about it. Whether its a product or an experience or a feeling. That's where it all leads - you lose your agency. Getting rid of online marketing or nudging it one direction or the other won't really change it. You can ban it online outright, but it will persist in another form.
Our entire world economy is based on different groups vying for your attention to monetize, to the point that as we go further, nothing is not monetizable.
It's the Truman show, but everyone is Truman.
Of course this breaks down when shady actors manipulate in bad faith, but that's the price of freedom. To put a ban into place as extensive as you're suggesting would be to regulate speech as far as I'm concerned.
How about this: Any action taken by an individual or organization with the intent of influencing another individual to execute a commercial transaction.
No billboards, TV commercials, newspaper advertisements, hyperbolic statements about products. I'm sure some wacky new loophole would be found, but it would be just that, some wacky loophole, not a massive trillion dollar industry built around manipulation.