A friend and I published some apps on the Microsoft store a few years ago, when it was still for Windows Phone 7. We've received several emails from Microsoft saying we need to update this and that or our apps will be removed. Because the apps never did that well - not surprisingly in hindsight given the market size - we never updated them. However we still get checks occasionally from the proceeds. Microsoft never removed them. I think they're just desperate to have apps in their store and inflated app numbers they can brag about. They obviously know what to do, but just aren't doing it.