The graffiti at the end of the 'So help me God...' game is very weird. It's clearly spam - there's been about one attempt per hour to spam that game (so I've closed it) but it's very odd spam.
[snorgle] Yes, but I suspect it may be counter-productive. If link spam is not removed, that suggests the site it's on is moribund. If the link spam is removed, that means the site is live and the spam is unwelcome. And if the search engines score -1000000 page rank points when a link is removed, and only +1 page rank point when a link is added, spam-that-gets-removed very rapidly depresses the original inflated page rank scores. I assume the search engines' page rank algorithm is a bit more sophisticated than that, but I think that captures the gist of what they can do.