> Let me repeat: some people cannot learn faster than this,
You missed the whole point: people do not learn with this approach, regardless of speed.
The only benefit is keeping people engaged in a skinner box while watching ads, and selling them ways around keeping their track record engaged with said skinner box unbroken.
The issue here is that what you wrote is just not true. I did Ukrainian for a year. I started to be able to understand some of the content around a year in. I started to be able to parse Cyrillic.
I did tried other apps here and there, but none of them stuck for more them two days. Overwhelming majority, like almost all of what I learned is from Duolingo.
The progress was actually very real, painless and fine. I did not expected to be fluent. I improved more then would be possible without it.
It works for some people, clearly, as stated by some on this very thread.
I hope you will not move from "Duolingo is useless for everyone on this earth" to "anyone saying Duolingo is useful for her/him is in denial"...
You missed the whole point: people do not learn with this approach, regardless of speed.
The only benefit is keeping people engaged in a skinner box while watching ads, and selling them ways around keeping their track record engaged with said skinner box unbroken.