When they compress — as they did in Q4 FY2026, dragging net profit down 12.5% — the whole group feels it. It's 488 million subscribers paying monthly fees for mobile data, voice, broadband (JioFiber and JioAirFiber), and increasingly for streaming content through JioCinema. The business model here is straightforward: charge each subscriber a monthly fee (ARPU was around $2.40 and rising after two tariff hikes in 2024-2025), then layer on additional revenue from enterprise connectivity, cloud services, advertising on JioCinema, and commerce through JioMart. Revenue model: Reliance earns from Oil-to-Chemicals (refining, petrochemicals — ~50% of revenue), Jio Platforms (telecom, broadband, digital services — ~15%), Reliance Retail (grocery, electronics, fashion, pharmacy — ~30%), and Media/New Energy (~5%). Jamnagar can switch between crude grades based on price spreads, shift its product mix between diesel, jet fuel, and petrochemical feedstocks based on demand, and absorb the heaviest, cheapest crude that competitors' simpler configurations can't process. A subscriber who pays for mobile data, adds JioFiber broadband, watches JioCinema, orders groceries through JioMart, and takes a loan through JioFinance might generate $15-20 per month in combined revenue across the Reliance ecosystem. The conversion engine is already running: JioMart grocery orders, JioCinema subscriptions, JioFinance lending products, all pushed through the same digital pipe at near-zero marginal acquisition cost. Plenty of things went wrong — delays, cost overruns, fights with bureaucrats over licenses. Announced in the early 1990s, commissioned in 1999, and expanded to 1.4 million barrels per day by 2009 — making it the world's largest single-location refinery complex. But the logic was pure Reliance: if you're already making petrochemicals, why not control your own feedstock?