That is actually quite nice. Apple does good things from time to time, I just don't like their devices. But I think there are ways to access iTunes without an Apple device.

You can use iTunes purchase from the iTunes store on Windows.

And, as of very recently, there is an Apple Music web-app (https://beta.music.apple.com).

But Apple Music is streaming-only with DRM, not DRM-free downloads.

When you purchase a song from iTunes, it is DRM-free. When you download it through Apple Music, it is not.