Which wouldn't have necessarily been a death knell, except by the point Microsoft had gotten their eggs into the Windows Phone basket, major platforms had already started shutting down functionality that could be accessed through third party applications so the App Store/Play Store official versions were the clearly superior ways to use the platforms.

In many cases, like with reddit even, third party applications are how many people have preferred to access these platforms, so long as the platform doesn't lock down the API to kneecap them.