It has been fun project but now I am glad that I have never considered making anything serious out of it.
I did this project because my impression is that Spotify had been always trying to steer me not to music that I like but to music that Spotify makes most money of. It had always been paid promotions over user's tastes in music.
And I am not on Spotify anymore for years now. Apple Music have really tasteful recommendations and music curation.