> Once it achieved monopoly power, Amazon squeezed on price through fees to third-party sellers. As a third-party seller, you pay fees for listing on Amazon; for using Amazon’s warehouse services, known as Fulfillment by Amazon (FBA); and for advertising services. If you don’t pay, you don’t get put in a place on the site where consumers click.

So consumers get free shipping that is mostly paid for by third party sellers because it gives them access to a massive customer base. I dont see the problem?