The thing with open source code is it's meant to be taken, altered and used. It's just that some folks don't grasp the concept of credit due. They may do it innocently thinking they can share a piece of code they liked, but others just blatantly take credit for it. They know they're doing it and it will wear at their conscience, so they're doing more harm to themselves than anybody else. The more we ignore our conscience the more hardened we become. These folks are hurting themselves bad enough, so I'm not too happy when they get criticized publicly as that will only lead to more grief. The best thing we can do is simply warn them, delete the snippets and give them a chance to rectify the situation. It could be they just need a good example in their lives.