We do have a small number of gift cards in our range for which we only accept digital currencies. The individual gift card brand pages will have information included on them, stating where digital currencies are the only accepted form of payment.
Digital currencies have very low fees when making payment with them compared to card payments. In some instances, therefore, a gift card is not financially viable to be included in our range if we were to accept card payments with their higher payment processing fees.
We will of course add card payments for these gift cards if it becomes viable to do so in future.