So if I had enough money I could get CBS news to deny the Holocaust? Of course not. These companies operate under government license and that would certainly be the end of it through public complaint. I think it suggests a much different dynamic than most of this discussion presumes.

In particular, our own CIA has shown that the "Big Lie" is actually surprisingly cheap. It's not about paying off news directors or buying companies, it's about directly implanting a handful of actors into media companies, and spiking or advancing stories according to your whims. The people with the capacity to do this can then be very selective with who does and does not get to tell the Big Lies. They're not particularly motivated by taking bribes.