“...the Ninth Circuit Court of Appeals rejected the notion that there is anything like a cause of action under the Lanham Act, the statue governing trademark law in the United States, for so-called trademark disparagement.”
I have absolutely no problem with Google rejecting the ad as they legally can. The problem is that they don’t have a pair big enough to say why. To hide behind a fictitious legal claim is weak. I believe they are afraid to tell the world what they really believe.