This retort always seems kind of trite and disingenuous.
First of all, no, they are not free to do these things unless they are billionaires with capital to spend. "Just start your own business" is a silly dismissal because the vast majority of people cannot start such a business. Second, it doesn't even address the original complaint. "I think Company X should do ABC." Suggesting they start a different company to do ABC doesn't really address what OP calls for: Company X changing their ways.