Nvidia faces growing doubt over how much it must finance its own customers to sustain AI demand. It fell 5.1%, erasing about $256 billion, on reports it could backstop up to $250B for an OpenAI data-center project, effectively funding OpenAI to buy its products. CXMT's surging debut added worry about Chinese chip competition. Apple overtook Nvidia as the most valuable company as markets separate AI beneficiaries from firms taking aggressive financial risks to keep the cycle going. x.comÂ