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.
People who think they have a right to deface other people’s property say the weirdest shit.
Again graffiti was not always seen as a crime. Remember many paints weren’t super permanent when applied to things like brickface for most of our history.