If you want to do something like this at home, I fully encourage you to try it out! It's an afternoon project if you've got an old laptop laying around, bonus points if you know your way around Unix. The key software component here is spotifyd, a Spotify daemon for any Linux boxes. So if you have a spare Raspberry Pi/Laptop/Smart Fridge that you'd like to bless with Spotify superpowers, it's really only a few keystrokes to set up!