Jensen Huang resigned as CEO of Nvidia after he reportedly had two affairs, including one with a purported Chinese spy. Why it matters: It's impossible to overstate how critical Huang is to Nvidia, to the AI buildout, to the stock market and economy. His departure could, per Wall Street sources, be the catalyst that endangers a ballooning AI bubble.Driving the news: Nvidia's board named longtime CFO Colette Kress interim CEO, while launching a search for a permanent replacement.