It's not Square's defence. It's every merchants'/processors' defence.
I have a card with information stored on a magnetic strip, a smart card, RFID and text. It doesn't matter which of these you use to steal the information, the result is the same.
I have a card with information stored on a magnetic strip, a smart card, RFID and text. It doesn't matter which of these you use to steal the information, the result is the same.