Earlier quoted context omitted.
Your questions are valid. But you could pick holes about any party trying to bring about change, right? For example, you say "let's be real here: Google doesn't exist to make the world a better place"...my question to you is, which org does exist purely to make the world a better place? And moreover, how are those orgs doing in terms of impact and scale?
Democratically elected governments exist to make the world a better place, at least in the views of those who vote in their leaders. Businesses exist to make money. That's the distinction being drawn. Pretending there's not a fundamental distinction between the two types of entities is disingenuous.
There are actually some "fundamental distinctions" between government and business. For example, most governments (democratic or not) are slow, monolithic, and effectively immortal. Since governments have tax and police authority, they can survive bad periods, including those caused by their own errors, for longer periods of time. Most businesses do not have tax and police authority and must face the market test on a daily basis. The businesses that fail the test typically die and new businesses replace them.