jet.com reached their 1B revenue target by losing money on every transaction: rather than have inventory, they relist competitor's inventory at lower prices. Which is why your jet.com purchase may bear the name of some Other online retailer when it arrives. Presumably Wal-Mart will correct both the inventory and the prices in the near future. And when the subsidies dissapear, so will the competition.
Besides which, isn't Amazon a cloud tech company with a vestigial retailing arm?