This is also why apps like Duolingo don't work for most users. They want to turn language learning into a fun, effortless game but effortless is fundamentally incompatible with learning.

Learning is uncomfortable. Reading a difficult (for you) text in a language you don't understand is exhausting and confusing. But that is where improvement happens.

Its even worse since Duolingo added a life system (not sure if they still use it), where you were only allowed to make 3 mistakes before having to recharge your energy. If you get everything right, you are not learning, you SHOULD be making mistakes constantly. That shows you're actually being challenged.