Hugging Face CEO Clem Delangue says open source AI is exploding, with his platform acting as a GitHub for models and datasets, now used by half the Fortune 500. Companies often start with frontier APIs but switch to open source as scaling costs rise, a pattern Delangue sees repeatedly. He argues the open vs closed source fight matters, especially after Anthropic paused its Fable release, and worries a few big players might dominate everything. Why it matters: This trend signals a potential shift in power from proprietary AI labs to a more democratized ecosystem, but the risk of oligopoly looms large.