Doulingo is in the interesting position of having such a big userbase with a locked in reward system that they could change their learning strategy overnight an

Doulingo is in the interesting position of having such a big userbase with a locked in reward system that they could change their learning strategy overnight and completely revolutionize languge learning forever. If course they won't do it, it's simpler to just space-repeat vocabulary and spend the money on people with green bird costumes making tiktoks