[nandemo]

I doubt you could easily initiate a chargeback because: they only accept debit cards, it's a card-present transaction, and presumably the buyer has to enter their PIN.

For the sake of the argument, you can still initiate a chargeback even if you don't claim unauthorized use of your card: e.g. you did make a purchase but the merchant didn't deliver the product, or the product was defective and the merchant refused to give you a refund, etc. But I don't think you'll have much luck trying to claim that a bona-fide financial institution gave you something that's not gold.