I observe the same. I have 700 streak, have completed two full courses. At the same time - I think gamification and nice packaging are the sole reasons Duo is

I observe the same. I have 700 streak, have completed two full courses. At the same time - I think gamification and nice packaging are the sole reasons Duo is a success. To be precise the gamification is mostly not about competing with the others, but being held hostage for your own streak.