Linux Foundation Executive Director Jim Zemlin delivers a thought-provoking keynote at Open Source Summit Japan, challenging the notion of an AI bubble. Zemlin argues that while large language models (LLMs) may be overhyped, the broader AI landscape is not immune to potential pitfalls. He highlights staggering investment figures, with hyperscalers accounting for half of the $3 trillion expected to be spent on AI data centers by 2028. However, Zemlin emphasizes the critical energy demands of AI's inference workloads, citing a 50-fold increase in Google's AI usage over a year. He also underscores the single biggest constraint on AI growth: power. Despite this, Zemlin sees open-weight models emerging from China closing the performance gap with commercial models, and predicts an era of performance and efficiency dominated by open ecosystems in 2026. He introduces the PARK stack (PyTorch, AI, Ray, and Kubernetes) as the next big thing in AI deployment, similar to how the LAMP stack defined the early web era. Zemlin concludes by emphasizing the importance of open collaboration in preventing vendor lock-in and driving innovation in the AI space.