1. DDoS attacks are ILLIGAL.
2. There is NO way you can DDoS true RS, only when YOU have the IP.
3. YouTube's ones are fake, they will make you part of the DDoS cuz your PC will be a sender of the attacks.
So, there are manny DDoSers out there ex. Dark DDoSer. There are allso people selling booters (online DDoS tools, working with Shells).