It's not. Walmart is not a 'marketplace', yet they could easily give you a replacement product from a different 'wholesaler', just like Amazon can give you a r

It's not. Walmart is not a 'marketplace', yet they could easily give you a replacement product from a different 'wholesaler', just like Amazon can give you a replacement from a different 'retailer'. There is no material difference here. Amazon owns everything about the interaction, they have just creatively outsourced creating product listings and a bunch of product risk.