The key problem here is that people think the government is acting in their interests. It's not, it's acting in its own interests, and the interests of politicians and regulators.

Thought experiment: imagine something that benefits the public but puts 100 politicians out of work. How likely is that to happen?

With a corporation you can withhold your support by refusing to buy their product. This can happen instantly with an internet boycott and is not limited to election cycles or $1 per person. With a government the process of opting out is much more laborious; short of moving out of the country, you have to pay their price as a package deal, regardless of whether you like with their product as a whole.