Global Fund Transfers Made Easy: Say you’re in a bind and need to load money onto your card quickly. With this technology, anyone from anywhere in the world can send Bitcoin to your card’s QR code, and the funds will promptly show up in your account. No more hassles, no more delays.
If you need fiat currency, it is much better and cheaper just to sell it in an exchange or p2p .
Of course yubikey in this case is just a white label service that will charge a fee. Cutting off the intermediate will save fees and make the service more secure.