The only problem is DDoS is usually performed with a rented botnet. With anonymous payment options like Bitcoin it can be very hard to pin on a certain individual. Now this is not to say that certain government agencies aren't capable of tracing such activities back to a person, but generally those with the capability to do so have bigger fish to fry than cheaters in online games. Couple that with the fact that players outside of the US could be the ones DDoSing and suddenly the issue becomes much more convoluted. Unfortunately dedicated servers for PvP are really the only realistic answer.