I had Zune ---Microsoft discontinued in 2015 ( I believe) and my collection is moved to Groove, now I get notice and Microsoft discontinues Groove and my collection goes to Spotify.
Lost quite a bit of my early Zune purchases due to the original WMA issue when Zune was discontinued, I guess we shall see. Some of my collection is not available on Spotify, when it transferred last week, I noticed it substituted some similar works by artists in my collection. I ended up with some new tunes that I didn't have by similar artists. I guess we will see how it goes now with Spotify.
Basically it is music that I listen to on my computers, and on my Zune player in my car.
Not sure if it has been worth the $$$ over the years with all the changes.