Like I said, I'm not going to die defending censorship of Hollywood or CBS or whomever, but I am much more concerned with the rights of ordinary citizens who only recently got the right to communicate in any sort of broadcast fashion (still nowhere near the power that the media industry enjoys).
True, calling them censorship is kind of stretching the definition.
But there's still a small group of people that decide those ratings and the commercial impact of those ratings, as far as I know, is massive.
So it's not direct censorship, but it still has a "chilling effect".