I assume it's related to revenue somehow. They could hide true shuffle somewhere deep in settings, not on by default, whatever..

I spend a good portion of my time changing playlists and restarting playlists just to get around their fake shuffle, and I still end up hearing repeated songs. It's extremely frustrating. I even tried out Amazon music, ready to make the switch, but my family members don't want to move with me, so I'm just dealing with Spotify for now. May end up paying for my own Amazon/Other music service as well.