Lord_Majestic - 11:44 am on Jul 7, 2008 (gmt 0)

Yeah, the operative word is deceptively.

I think the operative word is "different" - bots can't understand deception as good as humans, hell, in many cases most humans won't understand it until they are scammed, so bots have to rely on checking if content generation to SE is different from that shown to the user. That said I'd expect only change in visible elements to trigger it, though in this case probably NOFOLLOW games were not taken lightly, but it's just a guess.