There are tens of thousands of Google employees who have access to data which is commercially sensitive and worth, literally, millions. (To say nothing of how many search engineers could transfer a million dollars with a single hand-edit to "remove web-spam" on a single keyword.) Most of them are AdWords account reps, Google's dirty little secret: we'll pay you $40,000 to about one step above a call center monkey intellectually, you have no opportunity for advancement, and the work is soul-suckingly boring next to the Wow I Get To Work At Google thoughts that brought you here.
(Disclosure: I was once a call-center monkey, though not at Google.)
In banking or finance, there would be an entire department tasked with nothing but playing Big Brother over these employees. Failure to aggressively monitor for non-compliance would result in regulatory slap-down.
Does Google strike you as the kind of place where they monitor every entry made by employees and have an actual human perform random audits just to be sure?