This reminds me of when Facebook got cought playing silent music, to be able to be always running on after the user left the app. You had to force shut it by pushing it up to stop it from running, and of course draining the battery. The silent music was done, because Apple allowed apps playing music to stay on in the background, of-course because users usually want their music to continue playing, but FB decided to play silent music and then could stay on up/downloading in the background what the user was doing.
Spotify owes us an explanation why it was doing so much work in the background.
EDIT: As, commenters have been accusing me of making this up, here is a link for those that can't or won't google it. As an iOS programmer, their explanation did not make sense of forgetting playing silent sound on.
https://techcrunch.com/2015/10/22/f...kcPXnorOuftOBbtJ2yQF0nVW87lZIECYDXhM8GOwgdC82