It's because they already get unlimited music streaming for free, from multiple sources. The value added by Spotify's premium plan is ad-free unshuffled playbac

It's because they already get unlimited music streaming for free, from multiple sources. The value added by Spotify's premium plan is ad-free unshuffled playback and the offline option, so you have to see whether you have $10 in your monthly budget for just those features. I see the value there but it's also relevant to note that your phone can already do all that if you just buy music.