I once used their very strict account disabling policy to get a competitor kicked from Google AdSense. It was not even that difficult. I just spent a couple of minutes every day visiting his website, clicking all the adsense links, closing all the openend tabs, reloading the page and so on. It took a few weeks, but then the ads just stopped showing up (despite the Javascript code still being loaded) and a few days later the webmaster removed the code, which I assume meant that he god kicked.