I clicked on the link without much expectations, a broken HTTPS configuration is never a good sign, but I'm actually surprised by the results. It suggests the obvious similar artists, but also some very unknown artists with very few listeners on Spotify, but similar music.
The other website https://www.music-map.com/ is also interesting. It appears that I'm not very original in my music tastes.
Couldn't find a lot of info, but the creator Marek Gibney was featured in an MIT Tech Review article.
“If 90 percent of the readers of Douglas Hofstadter also like [Stephen] Hawking, the distance between these two writers in the Hofstadter-Hawking dimension is 0.1,” Gibney says.
The other website https://www.music-map.com/ is also interesting. It appears that I'm not very original in my music tastes.