Amazon makes something like 80% of their profit off of Amazon web services. They have no reason to give the tiniest crap about any physical product they will ever sell ever again.
Yes, and I recall an interview with a bank over a decade ago where someone asked why they have service charges when all it seems to do is piss off their customers. He tried to dismiss the significance of service charges by pointing out that they only represent 15% of their revenue. And yet they still have service charges.
The reason both these things happen is because profits are put above everything else, no matter how small they are or how irritating they are to the customer. Rest assured, Amazon is no different. They will happily engage in practices that encourage counterfeit sales until such time as they have indications that dealing with it will improve their bottom line. Even 1% will be worth it, let alone 20.