<ul><li>Duolingo's CEO, Luis von Ahn, has outlined three criteria for deciding what subjects to add on the app.</li><li>The first criteria is that the subjects must have a large demand, with at least hundreds of millions of people interested in learning the topic.</li><li>The second criteria is that the subjects must benefit the world, and the company will not add topics like Pokémon cards that do not meet this standard.</li><li>The third criteria is that the team within the company must be motivated and excited about adding a specific subject, as seen with the development of the chess course recently.</li></ul>

Duolingo's CEO has 3 criteria for deciding what topics to add — and explains why Pokémon and coding didn't make the cut

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