So that means you need to register an address for it while using a US IP address, right?
You don't need to add your physical address for CoinDebit virtual cards, but they opened beta applications only for IP address from US, so they might refuse to issue card for you with different IP address.
That'll make it like a Walmart card then.
No they won't, this can be used almost anywhere, it's not a gift card.
Though I am not sure how hard it will be to expand to non-US merchants, considering that worldwide prepaid cards have become quite hard to find nowadays.
I am sure that even now people applied for CoinDebit cards from countries outside US, so they will check if everything works or not during this beta phase.