A few months ago, I received a unnatural link warning from webmaster tools for one of my better sites.
It has many freely given links from .edu sites and also plenty of other probably lower quality links
I have never bought, begged or traded any links to this site so I am assumed I was penalised for giving links from other sites I run that are niche related.
Google can tell these sites belong to me as they all run the same adsense code.
I sent them a re inclusion request for this site explaining the situation and that I have now nofollowed all links (6) from my other sites.
They sent me a reply stating I was still in breach if their guidelines.
I sent some more reinclusion requests and got same response
This ticked me off so I decided to remove my adsense($60 a day) from the site and block all googlebots in my robots txt.I also put no index no follow in my meta tags.
By all rights Google should now, not be indexing my site as far as I know.
However 2 months later they are still showing my site for some main keyword searches with the snippet that "A description for this result is not available because of this site's robots.txt"
To me, this is another example of Google playing by their own rules and screw everyone else.