So, I do happen to have relevant experience. I haven't run a concert or a protest, but I've done the rest of the things you mentioned, some of which at considerable scale.
You continue to beg the question. "Without advertizing, companies would not be able to scale" is not a weakness of the push to ban advertizing - it is a virtue. The people advocating against advertizing _actively want_ businesses to have a smaller maximal size.
We got here because of scaling. We can now efficiently tap into the mental space of billions of humans at the same time. And that’s not just a problem, that’s THE problem.
Meaning that “this doesn’t scale!” isn’t a side effect. It’s the main effect, it’s the solution.