Evidence suggests they’re about as neutral as you could hope.
It’s not like Google search is some kind special tool used only by the elite. It’s pretty trivial for political scientists to pump queries into Google and measure the results. Which is exactly what many have done.
There’s been plenty of independent research into political bias of Google search results, and plenty of lawsuits that have gone fishing via discovery for internal evidence of bias. As yet, nobody has found a smoking gun, or any real evidence of search result bias (on a political axis, the same can be said for commercial gain).
There are many problems with Google, and Google search. Google as an org isn’t politically neutral (although I have no idea how they could be). But political bias in their results isn’t one of those problems.
