It doesn't match my experience. In almost seven years at Google I've worked on amazingly interesting projects - from hardware to user-facing products.
I've never once, in my entire time, had any level of management tell me that I should be worrying about selling ads or monetizing my projects. The consistent message has been "build great products".
So the notion that 99% (or really any majority) of developers at Google "drive the ad hive" is completely untrue - at least in my experience.