Which innovative pricing strategy did Duolingo initially pioneer that revolutionized the language learning app market?

The language industry has its own unique pricing strategies and models that have evolved over time. From per-word rates to hourly billing, from subscription-based language learning apps to premium translation services, the way language products and services are priced reflects both market demands and linguistic complexities. Test your knowledge about how language products are monetized in this challenging trivia question!

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Freemium model with optional premium subscription (Duolingo Plus/Super)
Pay-per-lesson with microtransactions for additional grammar exercises
Translation marketplace where users earn credits by translating real documents
Enterprise-first model with B2B focus before introducing consumer options