Thats because most of DDoS programs uses YOUR internet, to send packets..
And you will only get banned by that
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
IF you want something that really works, you should go buy one.
Or go buy a webbooter, or make one yourself.
You just gotta find some shells..