Which language learning company revolutionized the subscription model for language acquisition with its 'freemium' approach in 2012, eventually reaching over 500 million users worldwide?

The business of language has a fascinating history of innovation, marketing strategies, and brand development. While dictionaries and language learning tools might seem like purely academic products, they've been shaped by brilliant marketing campaigns, subscription models, and corporate rivalries. Test your knowledge about the business side of linguistic products that have changed how we learn, communicate, and think about language.

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Duolingo
Rosetta Stone
Babbel
Memrise