IIRC it spammed websites with traffic, didn’t conceal your IP at all, and some people got arrested for using it to make some websites go down for a very brief period. Basically a way to use people who didn’t know what they were doing as cannon fodder
I know that’s how it works in the US, but the lawsuit is in Japan, which you always hear about having stricter copyright laws. Not really sure how this one will play out though.