On the first point, I’m referring to a new kind of marketplace. Essentially something made explicitly to address the problem you mentioned. A generic marketplac

On the first point, I’m referring to a new kind of marketplace. Essentially something made explicitly to address the problem you mentioned. A generic marketplace that enables the discovery of new products/markets is conceivable. Regarding regulation, physical spade is definitely one part of it. But the public is also generally against nuisances, including too many advertisements. It’s an imperfect analogy, but not too far off.