Microsoft published Alan Wake. The game ended up on PC and this saved Remedy from bankruptcy.
Steam saved Remedy from bankruptcy: https://youtu.be/Ms7sAv_DnMc?t=1m20s
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Microsoft also published Ryse: Son of Rome. And this almost sent Crytek to bankruptcy.
Amazon saved them: http://gamerant.com/amazon-crytek-bankrupt/
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Rise of the Tomb Raider was also published by Microsoft and did not perform as expected (sales wise) Lets hope Steam can save the franchise.
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There is one company that couldn't escape going out of business after developing an XBox exclusive, that is Lucas Arts.
The commercial and critical letdown of Kinect Star Wars killed Lucas Arts.
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Do we really need to keep wondering why all these new XBox games are going to PC? Really?