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Working better together: Protecting against invalid activity
...sometimes these tools result in good publishers who become a source of invalid activity having their accounts disabled without much recourse. We’re making some changes we think will help fix this:
•We are considering tenure more actively when responding to detected invalid activity.
•We’ve given publishers tools to submit more informative appeals via a new form...
•We’re providing more details on invalid activity’s causes.
•...you can review the do’s and don'ts of ad traffic in our expanded AdSense Academy [support.google.com].
•In order to help publishers avoid common pitfalls, we’re kicking off a video series [youtube.com] that explains why some of our policies exist...
This implies that an account with good standing in the long-term was not previously taken into account.
What they need to do is take a much stronger stance against sites that blatantly copy, jump to #1 in the rankings , and rake in the AdSense money off your own work.