There was a point where Duolingo was trying to teach languages including endangered ones as their primary goal. But it feels like every year they're moving more towards making money as their main main objective. I'm not optimistic about them expanding their list of languages. Most of their lesser known languages are getting fewer updates than Spanish, French, Japanese. It makes business sense to focus your hours on features and languages people are actually using but it's still frustrating thinking of what Duolingo could have been and used to promote vs what it turned out to be.
It's not just about the money. You can make an argument that they want to serve as many people as possible in the best possible way, and that means concentrating their limited resources on the languages people want to learn most.
