Which linguistics-focused product development strategy did Duolingo use that revolutionized language learning apps?

Language plays a crucial role in product development and branding. Companies invest significant resources in linguistic research to create memorable names, taglines, and brand identities. This poll tests your knowledge about how linguistics influences product development in the language learning and translation industry.

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Gamification through linguistic behavioral psychology (streak maintenance, XP points, and competitive leaderboards)
Neural machine translation integration (similar to what powers Google Translate)
Immersive AR language environments (using camera recognition to label objects in your surroundings)
Voice-to-text pronunciation analysis (using phonetic recognition algorithms to score pronunciation accuracy)