I don't see the problem. I do hope it works out for them. It would be neat to have a debit card that pulls directly from a crypto account without going through a prepaid visa. As I said, I'm not a believer, so I'm not buying any XPY over it, but it sure would be great if it happened.
What makes you think that this is a direct deal with MC? The whole "announcement" was just a screenshot of an e-mail that mentioned MasterCard, right? So it could be just a bunch of MC gift cards from Walgreens?