It had the exact opposite effect for me. I used Spotify for a couple of years and basically only listened to the same playlists over and over again. Only when they forced people to use Facebook to log in I stopped paying and using their service and suddenly a whole new world oppened for me. I started using SoundCloud, Jammendo and YouTube to find new music from outside of the mainstream and never looked back.
This was four years ago, in the meantime i built up my private music library mostly with Vinyl + MP3 download codes and went all the way to mimic Spotifies technical solutions and can stream my library from a Raspberry Pi at home https://jeena.net/private-music-streaming