DePIN is reimagining physical infrastructure, including telecom and transportation networks, energy grids, and more. The opportunity is huge: The World Economic Forum projects the DePIN category will grow to 3.5 trillion by 2028. The Helium network is the best-known example. The grassroots wireless network now provides 5G cellular coverage to 1.4 million daily active users across more than 111,000 user-operated hotspots.(a16z crypto)