

I will say, with Duolingo I do appreciate the manipulation to keep me going. I probably wouldn’t have spent near as much time on another language if it weren’t for keeping that streak going. I can definitely understand the harm in it being used for maligne purposes. With any tool, it’s who wields it and for what intent.
As a single tool, no, not a chance in hell of becoming fluent. It’s definitely a good aide and introduction to branch out into more media and sources of another language though.