Over a week ago Steam banned a dev for a year for exploiting a vulnerability in its code. Tomáš Duda is a developer for a fairly popular steam game called Euro Truck Simulator. He had discovered a vulnerability in Steam’s code and notified Valve of the security risk, yet they failed to fix it. He decided to make a point by exploiting it in a completely harmless way, thus forcing Valve to act.
And act they did.