Many people miss this important distinction

Despite all of the faults of big mega corporations, you at least have the option of not doing business with them

For governments, no such option exists. Your property will get confiscated/violated if you don't do "business" with them. They can never go bankrupt as long as they are able to violate and expropriate the property of its citizens

Of course, this distinction gets blurred when corporations leverage the power of government + central banks to grant themselves unfair monopoly privileges, especially with bail outs and subsidies. But this points to the problem back at governments + central banks not allowing a free market in money production.