About anonymous.google in a placement report
This article covers anonymous placements.
You might see placements marked as "anonymous.google" in your results. Some publishers choose to offer placements anonymously and do not disclose their site names to advertisers. Even though the publisher and website remain anonymous, you will still have access to reporting statistics from the ad placement.
If you choose to place your advertisements on anonymous publisher inventory, you agree that any image and reputation standards that you may have for those publisher(s) are sufficiently addressed by the policies that Google enforces against publishers.
If publishers violate these Google policies, then Google has the right to take action against those publishers, including, without limitation, removing those publishers from Google's services.