I get what you're driving at, but unfortunately with auto-updating game platform delivery systems like Steam, this is sort of the way the world works. I'm sure

I get what you're driving at, but unfortunately with auto-updating game platform delivery systems like Steam, this is sort of the way the world works. I'm sure there are dozens of MMOs with the same arbitrary code execution. Hell, if you're using any browser extensions in firefox/chrome, you're effectively open to the same vulnerabilities. (which did in fact happen, somebody's Chrome dev account was hacked and malicious code was injected into the extension which affected all end users).