Which innovative product launch strategy did Duolingo use in 2011 that revolutionized the language learning market?

In the language learning and linguistics industry, product launches can make or break a new offering. The way companies introduce new language learning tools, translation software, or linguistic research platforms often determines their market success. This poll tests your knowledge about a famous product launch strategy that transformed how we approach language learning technology.

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Gamification of language learning with a freemium model
Celebrity linguist endorsements and academic partnerships
Virtual reality immersion experiences for each language
Exclusive focus on endangered languages preservation