I notice that if we do all or most of our daily quests, they get steadily harder. I am not sure how far Duo stretches that rubber band, because in the end I just don’t care that much about the imaginary characters and their bizarre projects. If I don’t have fun, why should they?
Finnish is difficult, no doubt about that, and I realize I have to repeat a lot after I spent a week without my smartphone in January. (An accident landed me in hospital for some serious surgery, and it took some time before I could resume my language practice.) But I would bet good money that this stretching of the goals is a feature that is built into the system for all languages. Since most users pay by watching ads rather than a monthly subscription like I do, it makes sense to try to keep them clicking. Until they get fed up and leave, at least.
We are paying for your boardroom furniture, don’t insult our intelligence if you want to continue to use that furniture.