Which language learning subscription service pioneered the "freemium" model with gamified lessons and was the first in the industry to reach 500 million registered users?

The language learning industry has undergone significant transformation with the rise of subscription-based models. Traditional methods of language acquisition through textbooks and classroom settings have increasingly been supplemented or replaced by digital subscription platforms. This poll tests your knowledge about this evolution in the linguistics retail space and how subscription models have changed how people around the world access language learning resources.

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Duolingo
Rosetta Stone
Babbel
Busuu