It's hard to draw meaningful conclusions form a single 4 year period. There have been several instances of corruption (and significant externalized costs) in private firms that went on for much longer than 4 years.

I agree that there is a lot of corruption in government but there's a long gap between that and no accountability. We see various forms of government accountability on a regular basis; politicians lose elections, they get recalled, and they sometimes even get incarcerated. We also have multiple systems designed to allow any citizen to influence government.

None of these systems and safeguards are anywhere close to perfect but it must be better than organizations that don't even have these systems in the first place.

What makes governments any more susceptible to corruption than a private organization?

I'm not actually talking about governments having absolute control. That's a pretty extreme scenario to jump to from from the question of if it's better for a private company or a government to control search.

Right now we think Google is misusing that data. We can't even get information on it without a leak. The government has a flawed FOIA system but Google has nothing of the sort. The only way we're protected from corruption at Google (and historically speaking several other large private organization) is when the government steps in and stops them.

Governments often handle corruption poorly but I can rattle of many cases where governments managed to reduce corruption on their own (ie without requiring a revolution). In many cases the source of that corruption was large private organizations.