The American brand still has a lot of value and a lot of American exports are tied to that brand. A large part of that brand is Freedom™. If the USA were to go full fascist, that brand is fucked.
There is also the idea that part of America’s media strength is based on a free market for cultural output. A fascist America would likely not have the ability to pump out the quality of media that it did before due to government censors.
I think the strongest brand America has ever had is capitalism™. And I don’t think anything would change in the entertainment industry if America was openly autocratic. I think the US is organized that way for a very long time, just with a veneer of democracy to keep the people somewhat happy.