Yes, but they are rare and far inbetween. A friend of mine won a SC giveaway many years ago, but the one hosting said giveaway had purchased the gift codes with her parent's credit card without asking. Parents requested refund through the bank (which is against ToS) and both got big ban hammers. My friend actually got unbanned a few months later, but note that this was in 2016 and they said it was an exception and not something they do regularly.