Well, even if they were scammed, at least they were running philanthropic projects like World Community Grid and Rosetta@home, so one might say it was for the good cause.

Today, you become a part of the PoW botnet by simply visiting certain webpages with your browser. It probably happened to many of us here, while perhaps we haven't even noticed.

https://www.cryptocoinsnews.com/pirate-bay-resumes-mining-monero-using-visitor-cpu-power