Because your edit implies that Psy's success was solely on the merits of his music video and official marketing, and that infringing parodies were not able to dent that success.
The original (and the one I prefer) implies that Psy's success was due in part of the infringing parodies, because of the network effects created by these parodies.
The original (and the one I prefer) implies that Psy's success was due in part of the infringing parodies, because of the network effects created by these parodies.