This only shift the responsibility. Now those with the authority to provide a good reputation decide who gets to sell their goods. For example you would probably have a problem with dangerous electronics in a decentralized market. Only experts can tell you whether the USB charger you're looking at is safe, so whoever moves first to become the defacto authority for electronics safety in that marketplace effectively controls who can sell.

Not that I think that this is a bad thing. As a consumer I want somebody else to take care that the things that I can buy don't kill me and I wouldn't trust some random commenters on the Internet for that kind of information.