Nvidia's biggest long-term advantage faces its toughest test as AI companies build their own chips. DeepSeek is reportedly developing its own inference chip while raising $7B at a $52-59B valuation, and inference is one of the fastest-growing parts of AI. OpenAI, Google, Meta and Amazon are also investing in their own chips. Export controls have already cut Nvidia's China business from 20-25% of revenue to about 9%, with Huawei filling much of the gap. x.com