Duolingo, the world's largest language learning platform, has recently replaced human translators with GPT-4, resulting in the unemployment of thousands. The decision to lay off employees was primarily driven by cost reduction, as AI tools may not match the quality of human work but have significant advantages in speed and cost. Duolingo's collaboration with OpenAI has sparked controversy. The global AI wave has raised concerns about the job market, with Goldman Sachs reporting that AI could potentially replace 300 million full-time jobs, with varying impacts across different industries.