but what the fuck do you want, a patent on business model?

Not on the business's side as they basically contribute very little of value here, but the argument might be that Amazon is such an important part of the logistics and last mile infrastructure in America that in order to prevent a monopoly we need to either nationalize it or split it up. If Amazon (or Walmart) were a collection of small regional companies they wouldn't be able to decide which businesses survive at the click of a button, they also wouldn't have the downward pressure on employee salaries they currently do.