How exactly is this useful for ecommerce in general?
One could argue that the data monopolistic nature in centralization is critical, but at the other hand, bringing a decentralized concept into a marketplace is not exactly new. Listia was one of the example. It introduces a lot of significant problems again later on, among which censorship and arbitration issue.

Please let me know why exactly is this needed at all in ecommerce? The idea of having a secure transaction as your strength is not a good idea at all. I can't imagine that my transaction via amazon, ebay, etc are not decently secure enough for the application (ecommerce).