I'm almost sure they're not. In all my years working for the ads section of Google I've never once heard the tiniest hint of anything like that, but I have repe

I'm almost sure they're not. In all my years working for the ads section of Google I've never once heard the tiniest hint of anything like that, but I have repeatedly slammed my head into the firewall separating Search from everything else. Google seems quite determined not to risk being seen as biased in that way.