Keep in mind there's nothing exclusive going on here. Emulated classic Amiga games won't be saving Windows Phone 8 from certain doom and death. With less than 3-4% marketshare it may soon share the same fate as the Zune.
Unlike Zune, mobile versions of Windows are of extreme strategic importance to Microsoft and they will do everything they can to try to make it a success, which would include giving away free licenses to OEM partners, etc.
Zune was a hobby, Windows on mobile devices is not. Thinking otherwise would be a mistake.
