The reason is purely pragmatic. US sanctions policy constantly forces Nvidia to "throttle" chip performance for China. Producing artificially slowed hardware amid massive demand for full-fledged accelerators from American hyperscalers has become economically unviable. Nvidia is making a cynical but logical choice: TSMC will only print high-margin advanced solutions for the West. This decision will provoke an even greater shortage of computing power in the PRC, forcing local labs to switch to Huawei Ascend clusters.
Source: Financial Times / Reuters
HardwareNvidiaTSMCVera RubinSanctions