If the goods and services you sell in this market are legal, then what is the reason for making it decentralized? I can understand decentralization in mixers and services that may need to enhance privacy, but purchasing goods and products may be linked to knowing the buyer’s address, which makes it difficult to provide a service of a privacy nature. The market can be implemented for digital products not physical goods.
You can meet in a public place to exchange goods - no one needs to know your address.
Yes, but a market place like this must offer international transactions, so you cannot apply this to all scenarios.
There should be something that encrypt that kind of details and just provide a key to the buyer and seller, when they want to do business. (The key can change for every individual transaction)