Regarding their desktop client; totally true. I recently discovered that keeping the Spotify App idle over 2 days, it had written 50 GB to my SSD. Not worth killing my disk over this service.
Ugh, there's so many things like this. My Spotify is also constantly adding data to my local app directory even though I told it through advanced settings to store all music on a different drive.
For an app that's just a web backend in a wrapper, it is horrifically inefficient.
For an app that's just a web backend in a wrapper, it is horrifically inefficient.