Duolingo is a game, they publish papers studying the addictive properties of their product I comparison to slot machines. They are incentivized heavily to not produce fluent learners. If he's being pushed in another direction to learn, for whatever reason, all the better for him.

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danaris 25 minutes ago | parent [-]

Duolingo used to be a very effective gamified language learning system.

Then they decided they cared more about profits than providing a quality product.

Now they are best known for their dark patterns.

	▲	llbbdd 21 minutes ago \| parent [-]
		Yep, I noticed recently that on their official research portal they stopped publishing anything publicly in I think 2021. The last couple of articles before that were along these lines: https://research.duolingo.com/papers/yancey.kdd20.pdf I assume all the research after this point is too revealing to publish.