The idea feels like sci-fi because you’re so used to it, imagining ads gone feels like asking to outlaw gravity. But humanity had been free of current forms of advertising for 99.9% of its existence. Word-of-mouth and community networks worked just fine. First-party websites and online communities would now improve on that.
The traditional argument pro-advertising—that it provides consumers with necessary information—hasn’t been valid for decades.
It’s also such a funny contradiction: a big part of the free market model rests on the idea that well informed consumers can vote with their wallet, which should reward good businesses and punish bad ones. Yet it is very difficult to argue consumers have ever been informed enough to make this work, which is in large part due to advertising flooding communication channels with noise, and also because it is unreasonable to expect a consumer to be fully informed for the hundreds of purchases they make on a daily basis.