As far as I understand it, the language came first and in order to teach it to others the founder created a screencasting tool of sorts, which became a company in its own right: https://scrimba.com
Ironically, it seems the company focused on content to teach primarily other technologies while using Imba to build it all. It's a rather fascinating story actually, which I'm paraphrasing and probably mostly got wrong, but if you're interested you can read more on their hiring page: https://scrimba.recruitee.com
N.B.: I'm not in any way affiliated with Imba or Scrimba. The first time I heard of the technology and the company was today, through HN, so I have no skin in this game. I'm probably also mostly wrong about everything above, so you know..
How do you make money out of it?
Are you working full time on this?
Why YC funded this, could you tell me opportunity here?