Spotify could certainly try to build their own device/platform it’s just that they don’t own the airwaves. But they could license the technology, build their o/s and develop their platform. Of course it’s likely to be very expansive and take years, but it would be another manufacturer and one more operating system in the cell phone space.
Yes. So since Apple spent many years and invested billions into the platform, Apple deserves to set the rules as to how they see fit.