Which major product development pivot did Duolingo make in 2011 before its official launch that fundamentally changed its business model?

In the evolving world of language learning and linguistics products, companies have pioneered innovative approaches to help people communicate across cultural boundaries. From early dictionaries to AI-powered translation tools, the journey of language product development reveals fascinating business decisions and strategic pivots. Test your knowledge about a pivotal moment in the development of one of the world's most recognized language learning platforms!

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Switched from a paid subscription model to a freemium approach with ad support
Changed from focusing on Asian languages to European languages first
Abandoned speech recognition in favor of text-based learning
Moved from a web-only platform to a mobile-first strategy