Valve's own games can't be played without Steam. If Steam isn't running when you open Portal 2, Steam will be launched automatically. If you uninstall Steam, Po

Valve's own games can't be played without Steam. If Steam isn't running when you open Portal 2, Steam will be launched automatically. If you uninstall Steam, Portal 2 just won't start. It would be one thing if Valve was setting an example that publishers were choosing to ignore, but that's not what's happening.