A Google Search Off the Record podcast involving a member of Google’s search quality team addressed the question of what to do when competitors are seemingly ranking well because of spammy tactics.
Google’s John Mueller in conversation with Duy Nguyen of Google’s Search Quality team mentioned how he’s often asked about what to do when sites that obey Google’s webmaster guidelines are outranked by sites that violate those guidelines.
There is an element of unfairness that can cause a publisher to consider joining in the spammy tactics.