> We’d also been careful to not ever violate Google’s Adwords weapons policy, which prohibits “the promotion of knives, such as butterfly knives, (balisongs) and switchblades.”
Sounds like they were promoting knives, and hence violating the policy.
The IM section was egregious too. How can they tout "Pidgin, the instant messenger for Linux (it exists for Windows as well, and for Mac OS X)" as an advantage of Linux?
The central pixel in the O is a lighter grey than its four nearest neighbours. That alone could be a reasonable cue for the 'hole', without cues from larger characters.