DDoS-as-a-service (DDoSAAS) is an emergence of “legitimized” attacks. The Open Resolver Project recently identified over 27 million DNS resolvers that appear open. The irony of legitimizing DDoS service, however, is that it shifts every organizations motivation to reduce open recursion from selfless act to preventative measure. So, they help raise the DDoS threat level, they also lend credence to the notion that corporate security is as much about corporate health as it is self-defense.”]
Source: https://www.darkreading.com/attacks-breaches/the-emergence-of-ddos-as-a-service