This seems to ignore the fact that they will null route traffic at levels high enough to cause degradation for other customers on the same physical equipment. How is this even a solution in a world where a 20Gbps DDOS attack for a few hundred dollars? Real DDOS solutions are still big money only because AWS does not invest to solve this problem on the core network. It's becoming common practice to a hire a 3rd party to direct the traffic off their network (cloud flare, akamai, etc) and do the filtering there.