There are 2 huge scrapers of our main site. Each of them has over 1.5 million indexed pages in Google and a huge traffic (17k Alexa). All the theft is automatic and the sites look totally like low quality MFA with 2 AdSense square blocks above the fold. They have myriads of backlinks pointing to them and all they do is adding bits and pieces of content from zillions of sites.
These guys have been online forever and we reported them to G many times without success. Please note that I am talking about the main 2 scrapers but there are actually about 100 more thieves taking content from our site boasting the same "business model"