3Blue1Brown made videos for Khan Academy for a while but ultimately decided to take his career in a different direction. He talks about it on the first episode[

3Blue1Brown made videos for Khan Academy for a while but ultimately decided to take his career in a different direction. He talks about it on the first episode[1] of the Numberphile podcast, which if you are a fan of 3Blue1Brown I'd highly reccomend giving it a listen. [1]: https://www.numberphile.com/podcast/3blue1brown https://www.numberphile.com/podcast/3blue1brown