Let's face it. We've all used Spotify to listen to music that we would be embarassed to advertise publically.
Whether it's kittens meowing Christmas songs, that your friends would never let you live down, or a hardcore rap album, that you wouldn't want your 8 year old cousin to go and listen to because his cool aunt or uncle likes it.
When it comes to this social music app, privacy is not a convenient bonus feature, it's a critical necessity.
Currently, the only way to listen to songs privately on Spotify, is to go to the settings and activate a private session. This is not only annoying, since I constantly have to navigate through settings to activate privacy on my phone, it's stressful because you have to worry about whether or not certain people can see what you're listening too. My primary music app should not cause anxiety about what I share publically.
From a 2011 blog post "Spotify is all about sharing and discovering new music. It’s entirely up to you what you decide to share and what you keep private."
With the first part in mind, it makes sense that spotify would default to making all of the music you listen to public to your followers but the second part is not true. Anyone can follow me on Spotify and if I have to continuously activate a private session, there will inevitably be times when I forget. As a paying customer, I should have the ability to hide what I listen to if I please and activate privacy indefinitely.