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What's the best way to deal with?
I think due to the nature of the site and the large amount of spam these guys produce, a simple email won't cut it.
Would reporting them to google be effective?
MAKE ABSOLUTELY CERTAIN THAT IT IS CLEAR, CONCISE AND NOT AMBIGUOUS.
People who read emails all day get things wrong all too often - you would not want your site to be added to a blacklist.
Some years ago, my solicitor wrote a letter instructing a bank NOT to cancel an insurance policy (she thought they might given the circumstances). They replied stating that the policy had been cancelled as requested. In other words, they read the letter and took it to mean the exact opposite of what was actually written.
No idea if they disappear because of my report but these sites work on volume, stealing content from countless sites, so got to think if 100 webmasters report the same site, Google notices.