A lot of funny people here.
Napster is not a Nintendo service. It's Napster decision's to be here, also since they have a tiny share of the streaming market maybe they thought that being present everywhere was the least thing they could do to gain market share.
But yeah seeing Napster is weird (even if it's clearly not the Napster we all knew back in the days). I personally want Deezer on PS4 or Wii U and it's not
It was on my Xbox One IIRC :/