Let's just agree that both can grow bad. It's just that clearly, governments+people can grow a LOT bigger (in absolute number of people) than a corporation, before it generally goes bad.
None of the largest corporations are really trustworthy, and neither are the largest countries stellar examples of good governing. The difference, however, is an order of magnitude more people being "managed". Apparently Google (Alphabet) employs about 100,000 people, most of them subjects not rulers. That's just a very small city or large town.
If we compare this to a small-medium sized country with a reasonably well-working economy, the difference becomes laughable: The corporation is a much, much, smaller group of people, with a disproportionally unwieldy huge amount of power, completely unable to control themselves and behave in an ethical manner. It's pathetic. YES they absolutely need a government to regulate them just like a baby needs someone to change their diapers.