Reader apps is quite wide category. It includes pretty much all types of content - ebooks, videos, audio etc. Spotify and Netflix falls under it afaik.
I have no idea what world you think you live in..but Apple has pretty clearly defined it mostly as Email and Ebook reading. Zero music or video services have ever gotten an exception. Spotify and Netflix have different exceptions called 'backroom deals' that allow them to have an unfair advantage over smaller players.