you do realize that microsoft charges $300K in order to even review a title for release on xbox, and not only that but it also has some hardware guidelines called Compliance Proficiency QA Testing, all titles need to follow each and every one of those rules and needs to pass all tests in their internal review or your game gets bounced back and you need to reapply and pay again if it bounces
Details but the first sub is free of charge. If you fail and have to submit again then you pay.
