I think you can get refunded for fraudulent charges, like if you get hacked. But if you leave an instance running or screw up auto-scaling somehow, that's norma

I think you can get refunded for fraudulent charges, like if you get hacked. But if you leave an instance running or screw up auto-scaling somehow, that's normally when the charges may tend to stick around. I believe they have a one strike policy, though that could have changed.