I don't get your point. Are you suggesting that Amazon alone should pay a tax on revenue (steering business to its competitors and reducing consumption slightly), that every company should pay a tax on revenue (steering business from more expensive and less vertically-integreated competitors to Amazon, but reducing overall consumption) or something else entirely?
Im saying all tax is paid by consumers in the end. But what is being taxed is still interesting.
I'm suggesting Amazon is currently doing what it does because of taxation law. It simply complies/optimizes. Profit taxed? Dont make profit. Pollution free, dont worry about pollution.