Well, if you don't pay with money, you're paying with your attention. Do you think they create this huge service just for funsies?
Tbf, out of all media streaming services across movies, series, and music, Spotify has the highes bang-for-your-buck. It's still like Netflix at that time when there was only Netflix and you could watch almost everything on one platform. I still buy records that I like on physical media like vinyl, but Spotify is such a great deal for convenient listening to all music out there.