What unique crowdsourcing concept was the original inspiration behind Duolingo's business model when it was founded by Luis von Ahn in 2011?

Duolingo has transformed language learning with its gamified approach, making language acquisition accessible to millions worldwide. Behind this language learning platform is a fascinating origin story that connects to both technology innovation and linguistic democratization. Test your knowledge of how this language learning giant came to be and the innovative thinking that sparked its creation.

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Users would translate real-world documents while learning, creating a dual-purpose system that generated revenue while teaching languages
Users would compete in language challenges, with corporate sponsors donating to literacy programs based on community achievement levels
Users would record native speech samples to build the world's largest open-source pronunciation database
Users would collectively build custom language courses for endangered languages to preserve linguistic diversity