a corporation can own the medium
that has nothing to do with the effects that use of the medium can have
you can write ransom notes with government-issued stationery
the fact that we broadcast on 'their' networks means we win teh 'war'
Sure it does, where, when, and how the product is used and why is decided by the companies. So no, the fact that we broadcast on their networks means they get a say in things. That is caving in.
Example, Michael Moore. His public perception (provided by none other than the film studios who finance and market him) is bad, and SECONDARY to the points he attempts to make in his films/documentaries.
If you have ever watched the News, you'll notice that things are ultimately put in the words of the people who finance and own the media outlets. And it is not just how they edit it, but the fact that it is shown on TV during such and such time that decides who will listen, and what they will listen to.