The Google PR department is probably going to print this thread and hang it on the wall as a testimonial to the effectiveness of their spam control brain washing campaign.
The only reason you thought they were able to automatically prevent that type of content from showing up is because they've spent a lot of time and money telling you that they can.
The reality is that the majority of spammers in the U.S. that end up getting dumped from the database are removed because of some type of human intervention, not some new, high-tech automated spam terminating cyborg that they developed.
Since the U.S. market generates the most traffic, the humans that are in charge of keeping everything looking nice and clean, tend to focus their time and effort on the most high-profile areas of search activity.
Keeping the most popular search queries as clean possible goes a long way in convincing the general public that spamming doesn't pay. Meanwhile, the spammers who work in foreign markets, or markets that don't show up on the radar screen continue to have succes using the same techniques that worked back in '98.