Google's comment: "We’re committed to providing users and creators with a great and consistent YouTube experience across devices, and we’ve been working with Microsoft to build a fully featured YouTube for Windows Phone app, based on HTML5. Unfortunately, Microsoft has not made the browser upgrades necessary to enable a fully-featured YouTube experience, and has instead re-released a YouTube app that violates our Terms of Service. It has been disabled. We value our broad developer community and therefore ask everyone to adhere to the same guidelines."[1]<p>Microsoft's responds by saying cooperation with Google has stalled because Google insists the app be built using HTML5, a technical restriction other mobile platforms are not held to.[2]<p>--<p>[1]<a href="http://www.zdnet.com/why-is-google-blocking-the-new-youtube-app-for-windows-phone-7000019460/" rel="nofollow">http://www.zdnet.com/why-is-google-blocking-the-new-youtube-...</a><p>[2] <a href="http://blogs.technet.com/b/microsoft_on_the_issues/archive/2013/08/15/the-limits-of-google-s-openness.aspx" rel="nofollow">http://blogs.technet.com/b/microsoft_on_the_issues/archive/2...</a>
This is what anti-trust laws are for.<p>Microsoft did stuff half as bad as this and had the Department of Justice regulating their business practices for more than a decade.