It's undefined because it's asking, "what is the inverse of 0/x" and x/0 has infinite correct answers if x = 0 and no correct answer if x ≠ 0.
I'd be scripting the consumption of lots of credits and sending the output to /dev/null to get a glowing performance review.
And recently like 1 of every 10 consecutive songs just doesn't play. When clicking on the song, it feels like the app tries to redirect original song link (the "app" is a website) to some other link and it doesn't find it. As an example, Madonna - Frozen (from 1998 Ray of Light album) just doesn't play, just tried.
I have been paying Spotify customer since 2008 or something, I have playlists that are so old that it doesn't show dates added. Last week I cancelled my subscription, and switched to YouTube Premium (no ads + YT Music). YT music is even more horrible especially with playlists. Maybe I just buy somewhere (Amazon MP3?) my the 10 most listened albums and call it my music listening for the future.
P.s. Im not a SWE for a living but I can see through this crap.