You seem to have missed the part about the investments they have made for the same, perhaps doing themselves what you suggest.
If I go to a restaurant and the food is rancid, I wouldn't be appeased when the owner tells me "we've made investments to stop the food from going bad, we even bought a refrigerator!".
The marketplace at Amazon makes it a (large scale) mall, or a food court for your analogy, not the shop that is selling. If the food from a restaurant at a mall comes out bad, would you blame the restaurant, or the mall?