Thanks for the info although I was around during the released of µTorrent and one of its early users, I didn't know Ludvig Strigeus was instrumental in the Spotify early days.
Apparently he also the original author of OpenTDD and ScummVM, and it seems that he's the legit Carmack 2.0 [1].
[1] Ludvig Strigeus:
https://en.wikipedia.org/wiki/Ludvig_Strigeus