Which of these language learning or linguistics companies has NOT partnered with the listed brand ambassador in their 2022-2023 marketing campaigns?

In the world of language learning and linguistics technology, companies often partner with influential figures to promote their products. These brand ambassadors help shape public perception and drive user adoption. This trivia question tests your knowledge of recent partnerships between language tech companies and their chosen spokespersons. Can you identify which linguistic ambassador relationship is authentic among these plausible pairings?

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Duolingo - Lily Singh (YouTube personality)
Babbel - Jonathan Van Ness (Queer Eye star)
Grammarly - Stephen Fry (British actor and language enthusiast)
Rosetta Stone - Zac Efron (Actor)