And one more thing. Are we talking about scraper sites? Or duplicate content? Or something else?
From what I see, most of the sites that got banned were / are online well before Adsense was introduced in 2003. I saw posts about being online since 1998 or 1999. My banned site is online since 2002, at that time AdSense was nowhere.
As we know scraper sites are a direct result of AdSense, they appeared well AFTER AdSense. I am sure google does have statistics about the age of the site, a simple if age < or > 2003 or something like this would have been resolved the problem (at least a part of the problem).
Any comments on this?