By Che Pan and Casey Hall BEIJING/SHANGHAI (Reuters) -Demand in China has begun surging for a business that, in theory, shouldn't exist: the repair of advanced Nvidia artificial intelligence chipsets that the U.

At least $1 billion worth of Nvidia’s advanced artificial intelligence processors were shipped to China in the three months after Donald Trump tightened chip export controls, exposing the limits of Washington’s efforts to restrain Beijing’s high-tech ambitions.

Despite U.S. bans, Chinese buyers spent over $1B on smuggled NVIDIA AI chips like the B200, openly sold on Chinese social apps.