I suspect their argument would be that they are more like a flea market. If you buy something fake or faulty at a flea market then the flea market probably isn’t liable, the seller is. Now, I don’t think this argument holds water, especially in light of Amazon’s practice of combining all of the stock of a single product into one place, regardless of who the seller is, so that there’s no way to know if you’ll actually get product from that seller.
This post isn’t really on-topic for c/technology. Please post it in c/Politics instead.