Author here. I left the Linux world 6 years ago, though my passion for making this kind of educational content has not faded. These days, I work in the games industry, and make videos explaining game graphics concepts.

https://www.youtube.com/watch?v=By7qcgaqGI4

I left a small retrospective the last time this got posted here. I believe what I’m doing now is far more interesting. https://news.ycombinator.com/item?id=21041340