Really? Who cares? With Steam, it charges your card. You notify your CC company of the hack situation, and that you haven't purchased any new games and they refund your money no questions asked.
It's way safer using a CC online than a Debit card in your hand.
While obviously not great, this is not a huge disaster. The credit card numbers were kept encrypted, which means that even if stolen they would have be decrypted to be of any use to the hackers. If any information was stolen, it was most likely personal data like your address and the data for your steam account.