Which innovative product positioning strategy did Duolingo pioneer that revolutionized the language learning market?

In the language and linguistics industry, product marketing often involves unique strategies that leverage our understanding of how language works. One particularly fascinating innovation revolutionized how language learning products were marketed globally. This poll tests your knowledge about a pivotal product positioning strategy that changed the industry landscape for language learning tools and platforms.

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The "gamification" approach, turning language learning into a game-like experience with points, leaderboards, and rewards
The "immersion method," focusing exclusively on target language content without any translation support
The "language exchange" model, pairing native speakers of different languages together as the primary learning method
The "subscription-first" approach, making premium content the only way to access comprehensive language learning