US corporations are significantly controlled by US laws. These laws can do things like stopping them serving enemy countries. (The recent Russia sanctions are an example)
I think I see your point, here: that, being a US company, the US can give it directions regardless of what the company would have chosen to do; and even in places the company is not compelled by law, it may be in their interest to stay on good terms with the feds where for a company based elsewhere it might not.
That is power.