Tech tycoons, led by Nvidia CEO Jensen Huang, lost a combined $94bn in the sell-off prompted by the success of DeepSeek AI.The sell-off raised doubts about the effectiveness of tech companies' capital spending on AI.Nvidia was one of the biggest losers, with Huang's personal fortune dropping by $20.1bn.Shares of Apple, Meta, and Amazon were largely unaffected by the DeepSeek news.