The idea seems attractive, but can it be implemented on the ground?
I mean, for example, suppose I ordered a product from the decentralized market and I am in a distant country. How will the product be delivered to me without knowing some details such as the address? How will transportation and delivery be done? Shipping the product requires knowing the recipient's details and identification.
For digital goods, no need to give any informations, the trade could go on in a fully anonymous way.
For physical products, your shipping address would be ciphered using the seller’s key, ensuring only him would be able to read it. This makes a two parties trade, with only one information shared.
If one doesn’t want to share its delivery address with an unknown —maybe reputed— seller, many ways exist to proceed without giving this informations. The good old escrow service, the package forwarding service, dead drops, public meetings, mailbox master keys, pickup points and so on …
That’s for the purists, the goal isn’t to give 100% privacy — even if anyone could — but to give life to an autonomous, decentralized and users-driven market.