Great extension. Would like to see AI-generated reading material that integrates everything you've learned til now. They also still haven't mastered the non-European languages - Duolingo is not the place to become literate in Chinese, but is ok for mastering a few phrases.
Better alternatives out there. Great idea, slightly clumsy execution. You don't learn programming syntax the way you learn linguistic grammar. It doesn't require the same repetition and pattern forming, but rather conjunction with other variables, operators, rules etc.
Genius idea. Would love to see it expand to other languages and include more pro versions like connections to meme making apps and accounts so you can make your own.