Source? Cuz I just don't believe that. A company as shady as Google is to their publishers, we barely ever see any transparency from the Adsense team.
They aren't shady. They are a huge company running a business and looking out for their shareholders. I, for one, am doing better with Adsense than I have since I started with them in 2003. The Adsense team contacts me fairly regularly. I ask questions, and they answer them.
Maybe we should go back to the days when there was no Adsense?