It's worse than that.

They DON'T kick bad actors off the store most of the time because they don't know who they are.

Amazon keeps all of product X in one place in each distribution center, regardless of the supplier. So they can't know which of the 35 sellers of the product is supplying the counterfeits.

I don't buy batteries from them anymore. I'm pretty sure 90+% of 18650 cells they have are counterfeit.