You don’t have to use them. That’s the point of my argument. No one’s stopping you from selling it using Shopify where you can set up an e-commerce store within a couple of hours.
And my point, as someone who’s worked in antitrust field for over a decade, is that Amazon is a company that does the least to exert monopoly power out of all the big tech companies. In fact, they do so little that I think they are being stupid.