Which innovative marketing strategy helped Duolingo dramatically increase user retention and become a language learning giant?

Duolingo has revolutionized language learning through its gamified app experience, but its product innovation goes beyond just teaching vocabulary. This poll explores how Duolingo has leveraged technology and marketing strategies to become one of the most recognized language learning platforms globally. Test your knowledge about this language learning giant's product development journey and market positioning strategy.

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The Duolingo owl mascot (Duo) meme campaign featuring guilt-inducing reminders
Their premium subscription model that removed all free learning options
Partnering exclusively with universities to offer academic credit for course completion
Requiring users to practice daily through mandatory paid lesson extensions