The forced integration of the PC version of Call of Duty: Modern Warfare 2 with Valve’s Steamworks platform has turned off other digital game distribution services.

IGN-owned Direct2Drive has opted not to offer MW2 on its service reports Gamasutra, calling the forced use of Steam a “Trojan Horse.” The company will offer $5 off other Activision games as compensation. From a statement on Direct2Drive’s website:

At Direct2Drive, we believe strongly that when you buy a game from us, you shouldn't be forced to install and run a 3rd party software client to be able to play the game you purchased.

Meanwhile, VoodooExtreme received confirmation from both Stardock and GamersGate that neither of those two services will sell MW2 either. Stardock elaborated to VE on the reasoning for not selling MW2 through their Impulse service:

We share some of the same concerns as Direct2Drive over the bundling of the Steam client with the game. The most obvious issue is the forced inclusion of a competitor's store that blocks us from carrying the game.

Our issues with the game are solely with the Steamworks bundling. We enjoy a great relationship with Activision and would love to sell the title, but not with Steam.

GP: A commenter on the Gamasutra story noted that Direct2Drive offers other games that require a Steam install, such as Zeno Clash. Of course that game will not move nearly the amount of copies MW2 will, so it appears in this case that IGN/Direct2Drive is just being selective in its stand against Steam.