Which language learning company was the first to implement a subscription-based 'freemium' model on e-commerce platforms, revolutionizing access to premium linguistic content in 2007?

The language learning and linguistics industry has undergone massive transformation with the rise of digital platforms. As traditional dictionaries and language learning tools moved online, certain companies revolutionized how people access linguistic resources. This trivia question tests your knowledge about a pivotal moment in linguistic e-commerce history that changed how language products are sold and consumed worldwide.

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Rosetta Stone
Duolingo
Babbel
Pimsleur