Yeah well

So Crystal Castles breaks the rules of the Creative Commons License and uses samples from Covox, Lo-Bat and others.

Well, Daft Punk used a sample on almost every song on Discovery, and let me tell ya- some of those samples were certainly not cited in the liner notes.
The KLF revolutionized sampling and caused a big commotion over it, but now that's all subsided and they're considered the parents of modern Dance music.
Girl Talk's albums are made almost entirely of samples.

So deal.