It is also my question. Problem is what benefits shops could gain by using debit card of Coin. Beside that, Almost people don't familiar with crypto currency, even don't trust so I think the fact that applying debit card of Coin will be a long story...
The point is, that the shop dont has to do anything. If there is a shop that accepts credit cards as payment, you can use your coin-based credit card there. The shop dont even know that you pay the credit card bill in background with coins... He gets his money in fiat. So for the shop it is the same if someone use a USD Credit or debit card or a coin based credit or debit card.
But the people that want to use coins, can do so wherever they want to and whatever they want for...
Exactly that, shops don't have a clue that you have credit card loaded with crypto, they just see conversion, fiat that they get from you.The real beauty is that you as the owner of that credit card can use crypto as a payment method basicly without any restrictions and you are in complete control over your money.That is a dream that is worth paying some fees to provider of that credit card.