DePIN integrates blockchain with physical infrastructure, redefining network resource allocation. This article focuses on bandwidth-sharing DePIN, exploring its core features, revenue models, and representative projects such as Grass and OpenLoop. It analyzes token economics and miner rewards, providing in-depth insights for readers interested in the convergence of decentralized networks and AI. Additionally, it examines the future potential of DePIN in AI, IoT, and Web3, offering a comprehensive view of this emerging sector's value and challenges.