Nowadays, video game production is a multi-million dollar affair. If the video game company were staying within the general "philosophy" of Linux, they would be expected to make the game open source.
Now why, might I ask, would a company like Squaresoft spend $10 million to produce Final Fantasy XI for Linux, then promptly be asked to open source it, thus making the game avaliable anywhere?
There's no money in it!
Video games are just as much about making money as they are about entertainment... just like movies. Remember that!