This is trickier, and it also happens to "real stores" as well. If someone in the middle of the supply chain does a switch from real goods to counterfeit, it can go unnoticed by everyone downstream.
However, when someone DOES notice, the situation must be remedied. Amazon should be liable to some degree for everything they sell. Consumers should have recourse. Maybe they already do? Can they return for a refund from Amazon if they dispute the authenticity of the product?
> Can they return for a refund from Amazon if they dispute the authenticity of the product?
Yes, very easily but that's not enough because Amazon still profits so massively from everyone else that it doesn't even raise a bell in their accounting.
However, when someone DOES notice, the situation must be remedied. Amazon should be liable to some degree for everything they sell. Consumers should have recourse. Maybe they already do? Can they return for a refund from Amazon if they dispute the authenticity of the product?