If they wait for complaints, that's not amazon doing the QC, it's the client.

But you can’t identify which seller your product came from. That’s the whole problem here.

But when you return the defective product, Amazon can see what seller it came from.

Are you sure about that? I thought part of the whole incentive for commingled inventory was that Amazon no longer kept track of it separately per vendor and just lumped it all into the same bin without a unique serial number.

Am sure and posted the link elsewhere on this thread

Counterfeit products are still a huge problem on their platform. Great QC.

Only if they only purchased one.

Ah yes, like how if a drug company poisons enough people then the market will make them go out of business. You know, because people died.