Yes, card cloning devices have existed for decades, but this automates the process, allows you to carry a single (disguised) device that can store multiple card

Yes, card cloning devices have existed for decades, but this automates the process, allows you to carry a single (disguised) device that can store multiple cards. If one doesn't work, try another card, without eliciting suspicion, and simply replace / swap cards that are cancelled. The old method requires use of credit card blanks, a duplicating device, and the card itself doesn't look like the card when presented in person. In this case, as someone mentioned, Coin doesn't display the card #s on the front, so it's like a Card Not Present (CNP) transaction, but needs to be treated as if it was. This doesn't bring anything new to the card skimming operation, but it simplifies, optimizes, and can in some ways facilitate it. They need some sort of ideally biometric authentication and/or a server that identifies when two Coin devices carry the same cards on it to avoid this sort of fraudulent use.