I used to rate Duolingo with 5 stars, but now I unfortunately have to change it. The app has been decreasing in quality overall, adding new useless animations at the cost of adding ads and more ads. Everytime you finish a lesson the app makes you go through 5 different screens, where you have to wait for the app to inform you of dumb things, like how you completed the lesson and got XP, then an ad, then another screen to tell you how is your streak, then yet another screen to tell you how is your position in the leaderboard, and you just have to wait a few seconds at each screen without skipping, after every single lesson you complete. The tip of the iceberg, though, was how they now removed the forum claiming that it was unsustainable, even though it was one of the best resources for the community to interchange knowledge. They gave away the forum in exchange of annoying animations.