Government is force. It is laws, police, courts and the ability to seriously screw up your life if it chooses.

A corporation might have "power" in an economic sense. It might have market significant presence in the marketplace. That presence might pressure or influence you in certain ways that you would prefer it not, such as the fact that all of your friends and family are customers/users of that faceless corporation.

But what the corporation cannot do is put you in jail, seize your assets, prevent you from starting a business, dictate what you can or can't do with your home etc.

Government is a necessary good. I'm no anarchist. But government is far more of a potential threat to liberty than the most "powerful" corporation could ever be.