It's kind of like a hub, where you can download and update modded Spotify.
In the modded Spotify, you have all the benefits of a premium account and actually more because the modded version provides its own benefit, minus downloading.
I'm scared of using that tbh, cause last time I used a modde version of Spotify (simply the tablet apk on android so it would let me play individual songs), they found out and sent me an email saying that they have the rights to delete my account and my playlists if it were to happen again.