He published it as open-source for like 5 seconds before taking the repository down in order to charge for it on Steam! I'm a little weirded out by that pattern of open-sourcing it and then just changing his mind.
I think what happened was that it became his full time job, and he started to need to be able to make money from it. At least, that's what I remember; I haven't seen much about it as of late.
I have a podcast interview with Ange where we talk a bit about the first time this blew up on HN
https://music.youtube.com/watch?v=bi6bLSCnjcY&si=r4atSKfsBEQ...