The penalty for this and that are just thrown around without a thought. No game would have this for the sole reason of how easy it would be to grief someone... Except WoW. They had a hunter epic quest that could only be solo'd. If anyone helped, it would enrage and one shot everyone. Of course that meant people would lurk around the mob to screw over the one trying it. It would then despawn and not appear again for 3 days. Good times