The control is only authoritarian if those being controlled by it have no recourse. As applied to governments, authoritarianism has strong central power and limited political freedoms. In the US, we believe in the principles of limited central power, and many political freedoms. (Whether or not this is the situation depending on who you are is the topic of another day because this is how it should be, and the only way it may have become not that is if we have allowed our complacencies to kick in and allow it to happen. I am a firm believer in the concept of "people get the government they deserve in a democracy." ) Ultimately the governmental authoritarian control is beholden to the people and can be eradicated. The only reason we feel as if it can't be is because we have allowed the power to creep up over the years and it seems like an insurmountable mountain, but rest assured if you pick up that pick axe and start chipping away rock by rock you absolutely can tear it down.
Likewise, authoritarianism applied to a corporation implies strong central power, and limited consumer freedoms. This is also patently false in the US. The US has anti-trust laws to prevent centralized control, consumer protection agencies, and the free market. The consumer ultimately always has the freedom to choose another option. If the corporation loses too many consumers, then the corporation goes under. I understand there is a lot of nuance, but this is the basic principles of how things should operate in this country, and the mechanisms for things to operate are in fact there. The question then becomes what are it's people doing about it?