Good article. It is certainly a murky situation if you do not have first hand knowledge of the rights involved. However, consider the situation when you are a copyright holder such as your friend Jon. Let's suppose he was very unhappy with Jacob's copying of his design (for the sake of argument, let's assume it is an exact copy). He can file a DCMA complaint with LL and they will take down Jacob's content. Jacob will file a counterclaim with LL and then they will restore his content. LL's hands are clean now and it is up to the parties to settle in court. That costs real cash money. In 99.9% of the cases it is hard to imagine that it is cost effective to sue. So what are Jon's real options? He can let it slide or he can make life miserable for Jacob so he takes down the content himself. Its easy to see how vigilantes arise in this situation when the spirit of the law cannot be otherwise enforced. LL ToS is insufficient to handle these kinds of disputes in-world.