When Corporate Power Is Your Real Government, Corporate Media Is State Media
In a corporatist system of government, where no hard lines are drawn between corporate/financial power and state power, corporate media is state media. Since bribery is legal in the US political system in the form of corporate lobbying and campaign donations, America's elected government is controlled by wealthy elites who have money to burn and who benefit from maintaining a specific status quo arrangement.
The fact that this same plutocratic class also owns America's media, which is now so consolidated that it's almost entirely run by just six corporations, means that the people who run the government also run the media. This allows America's true rulers to set up a system which promotes narratives that are favorable to their desired status quo.