Which famous polyglot endorsed Duolingo in 2019, helping the app achieve a 200% increase in premium subscriptions after revealing they speak 32 languages?

The language learning and linguistics industry has seen significant growth through celebrity endorsements that shape brand perception and user adoption. From language learning apps to translation tools, famous personalities have played crucial roles in popularizing linguistic products. This trivia tests your knowledge about a notable endorsement that transformed a language product's market position.

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Tim Doner, who demonstrated using Duolingo for Swahili in a viral YouTube video
Hyper-polyglot Luca Lampariello, who credited Duolingo for his mastery of Slavic languages
Ziad Fazah, who appeared in Duolingo's 'Fluency Challenge' campaign after setting Guinness World Records
Benny Lewis of Fluent in 3 Months, who partnered with Duolingo for their advanced immersion features