I guess people has a bit different view about how sticky platforms are. If I imagine that google would take a political side in the US election and ban all site and comments of the other side, my belief is that it would have a direct impact on the election results and there would be nothing that the banned party could do. Politics right now depend highly on being visible on google search, Youtube and google ad network. A small but noticeable portion of users would move out, but it would not be close enough to compensate the loss and the impact on the political climate would take years to recover.

I would like to be wrong on this and that google do not have this kind of power.