The "developers developers developers developers" company did an incompatible rewrite of their API what, 4x over? At one point even Osborneing themselves, announcing the new incompatible version of Windows Phone just before putting out the first devices that used the current version. You can only screw over your app makers so many times; sure you may not need thousands of apps, but Windows Phone didn't have YouTube, didn't have WhatsApp; at some point it's just untenable.
MS created a YouTube app. Google got upset cos it wasn’t compliant. MS removed the app temporarily and re-released it in the months later when it was compliant with Google, including new features that lacked in the older version.
The app existed for most of windows phone life. It didn’t get cut off. It was removed from the store for several months while MS fixed it. Anyone who had the app still had it.