I wold argue that "DoS" is not vague, just a broad term. Aanyway.. You're right, it boils down to bandwidth flood (or maybe CPU..) in the end. Maybe CoS is no

I wold argue that "DoS" is not vague, just a broad term. Aanyway.. You're right, it boils down to bandwidth flood (or maybe CPU..) in the end. Maybe CoS is not really a technical term, just made more relevant by the technological changes. OP would have been charged much less had he not been using "the cloud". Lets say I have small'ish competitor hosting their app on EC2. Using classical DoS techniques, how much can I ramp up their bill before they notice? Or can actually stop it? What if I run it on a smaller scale, "just" doubling their bandwidth bill.. Will they notice? Maybe they'll believe it's extra users ;)