After reviewing the official Spotify terms you referenced, I’m not quite sure what types of apps would be permitted at all? Sort of off-putting on Spotify’s part. The terms are so restrictive it makes one wonder why they would even offer the platform in the first place.
Edit: I’ve previously thought about some personal projects that utilize Spotify api/data, specifically to perform some exploratory data analysis of user-listening-history, but after seeing these terms, it seems like even that would be against the terms.
