Is there scope for a more open distributed app or service(which wont make much money for itself, but more broadly available like craigslist) to coordinate local

Is there scope for a more open distributed app or service(which wont make much money for itself, but more broadly available like craigslist) to coordinate local sellers, rating services, insurance, delivery companies which any one can opt into? Customers see all available local options for products and sellers. A seller doesnt just have rating but can also optionally be backed up by another company who ensures against product failure. Amazon, for business reasons, wont commoditize some core functions, which the above website can. Analogy would be to locked in social network vs email as an open protocol.