The gist is Spotify often remove music and grey it out - rights owners change, rights owners go down the pan. Rarely, there is an artist or record company boycott. The recording may be removed or you may be redirected when you click on to another source supplied by another agency to Spotify. It's just a conduit platform like all others. And of course recently they announced that they were axing low payments to artists and writers - unless their tacks reach 1000 plays per year. When there are millions of tracks, this tips the balance on minority genres. Huge artists and conglomerates get fatter, small artists get ripped off and their albums and tracks are given away. The self created policy is copyright theft. I would remove product if I got the chance.