Regardless where he got it, it's business logic, bungee would lose money from Microsoft which is how most of there games have been developed so really if they didn't they'd be quick to half there budget.
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Nothing is confirmed though think could change I'm not saying they will but it's possible
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Well if bungie didn't, they'd have to start giving permanent exclusive content to Microsoft but they wouldn't do that because Sony payed for temporary exclusive content. So they would have to give something up either way.