In a surprising policy shift from the U.S.’s years-long technology restrictions on China, President Donald Trump in July allowed Nvidia to resume sales of its H20 AI chip tailored for the Chinese market, reversing the ban his administration had imposed in April. Still, instead of celebrating, Beijing’s reaction has been notably lukewarm, even though it has long pressed Washington to relax the strict export controls. That’s because China is concerned about alleged security risks tied to Nvidia’s H20 chips, s ...