Learn from History. iPod did not actually roar until it + a version of iTunes came to Windows. Had Apple focused on Apple people then, perhaps none of what followed would have played out.
Apple's pond is much larger now- and very, very profitable- but the other pond(s) is larger still.
That depends.
I wonder how many of those paid spotify subscribers are android users.
Could even be that most of the paying customers of spotify have an iphone or are on IOS.