[trentnix]

Who said anything about forcing them to run any ads?

While the policies that prevent even insiders from finding out why some ad or another was banned to avoid special treatment, they also have the side-effect of being opaque to conceal arbitrary, malicious, or insidious motivations. After all, I'd assume if there are good, clear, generally agreed-to reasons why some ad (or even some account) should not have access to Google services, transparency would justify as much. But without transparency, it's inevitable that there will be abuse.

Odds are, there already has been. And Google benefits keeping that behind the curtain.