I believe people uploading piracy are upvoting themselves mostly, it's always the same amounts they get. If you feel rewards are unfair, you can downvote, in the end the same amount of money gets distributed through steem everyday, so by downvoting what you consider shit content and taking rewards away from it, these rewards are redistributed to all other contents, so you are not really wasting your power.
RE: D.Tube 0.5: Big Optimizations