Nickelodeon passed on Adventure Time, Ed Edd n Eddy, and Phineas and Ferb, and instead picked up Fanboy and Chum-Chum, Breadwinners, and Planet Sheen.
Now, you can say that AT, EEnE, and P&F wouldn’t have been the same show or wouldn’t have been as successful on Nickelodeon, but that doesn’t change the fact that Nickelodeon passed on those shows, and they became HUGE hits for their competitors. It also doesn’t change the fact that Nickelodeon passed on those shows, and instead picked up OBJECTIVELY terrible shows like Fanboy and Chum-Chum, Breadwinners, and Planet Sheen.