IANAL, but I don't believe that there are any US laws that would require Amazon to sell a product. If they sold real estate, or operated restaurants or whatever

IANAL, but I don't believe that there are any US laws that would require Amazon to sell a product. If they sold real estate, or operated restaurants or whatever, they couldn't discriminate over race, gender, religion, etc. But I believe that they could decline to sell products that catered to some protected class.