For posting all the anonymous reactionary bullshit that you can't post anywhere else.
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Graph is from Yahoo finance: https://finance.yahoo.com/quote/DUOL/?guccounter=1
Reuters news article: https://www.reuters.com/business/finance/duolingo-prioritizes-user-growth-over-monetization-forecasts-softer-bookings-2026-02-26/
"The language-learning app has spent recent years fine-tuning monetization through more ads and subscription prompts, helping lift bookings per user. But that coincided with slower user growth." Yes Reuters, that's called enshittification.
Unfortunately not familiar enough with Korean and haven't tried to learn it myself. To be honest, while trying to learn Chinese, I think apps should only be supplemental anyway to help with things like proper pronunciation and speech. Actual textbooks have been significantly better for pretty much everything else. Both China and Taiwan have government crafted textbooks that target their language exams, so if something like that exists for Korean, that's the route I'd recommend most strongly.
EDIT: It looks like it does exist and is called TOPIK, so there's probably good textbooks that target those exams as a good baseline for the language.