Biedronka is a discount shop. We can't require from these kind of shops that they may want to pay extra money for using terminals for card payments. Remember that in many of these stores you could find an ATM next to the till.

Most of the shops are not discount stores. They have normal products, with normal prices. They can (and should) pay some extra money for a possibility of card payments, because if they want to exist - they need to meet customers' needs. Today, most people expect that they will be able to pay by card.