So why not AMD work with the developer?
Even if the developer decides to include competing company's features in the game, that should not stop AMD from working with the developer to make sure that the game has a smooth launch.
If Nvidia could send a few people over to the developer site to work with the developer on impletmenting their features in the game, I don't think it is unreasonable for AMD to at least get in touch with game developer and work with them to make sure AMD hardware is not crippled or worse, bugged and glitched, for months until a fix is rolled out.
Further more, even as an MMO the game features fight with over hundreds and thousands of players on screen at the same time on the same server by using the Pikko server tech. That would require a whole lot of power and optimizations to make sure it runs smooth on even high end hardware.