I understand why Duolingo is concentrating on what makes them money and what the most learned languages are.
But as someone interested in "less popular" languages I don't like it. Even the Chinese course hasn't been expanded since it came out. And Finnish probably never will be expanded, since it was entirely volunteer driven and they don't do that at all anymore.
This is the same for me but with Basque. People have been campaigning to get a course published for years now, with volunteers willing to help, but for whatever reason they refuse; which is a shame as from a linguistic point of view it is a very rare and interesting language and culture and would help people in Spain a lot in my opinion.
But as someone interested in "less popular" languages I don't like it. Even the Chinese course hasn't been expanded since it came out. And Finnish probably never will be expanded, since it was entirely volunteer driven and they don't do that at all anymore.