Geez, that sucks.
But I mean, there’s sections on some black hat forums dedicated to getting your competitor kicked out of the search engine rankings (from Google bowling to filing a DCMA complaint against them on Yahoo), so there are certainly a lot of others who have had to deal with similar annoyances.
I think that the anonymity of the internet can contribute to this certainly. I mean, if these people really knew who was behind the websites, and how they depend on the income, then maybe things would change…