Seoul-based Riiid Inc. applies deep reinforcement learning to adaptive TOEIC prep: score predicted in 6–10 questions; 2.5 million users (TechCrunch 2021); beta …
Seoul, South Korea
Good practice★ 40
Evidence: Observational / pre–post
South Korea's $850m national AI-textbook rollout was found in May 2025 by privacy regulator PIPC to have two data-protection violations. Adoption fell …
