While I do believe that my subscription money should be split between the musicians who I listened to (algorithmic stuff excluded), in the end it doesn't really matter because the pie is too small. All my playlists combined have 1000+ songs with around 300 bands. At the current rate of 11€/month they would probably get 1€ in a few years if I would listen only to those songs. In fact, if you listen mostly to a few artists and you really care about their financial situation, just buy their albums/songs or go to their concerts.