Do not have any empirical evidence, but reality is that China's semiconductor capabilities are not at par with Taiwan yet and the US is able to influence Nvidia's sales to China as well as access to other vendors (TSMC) and technologies, giving the West an unfair advantage.

Just like Chinese EVs and Chinese renewables eventually beat the West, I have no doubt that China can probably eventually pull ahead, but I think it is probably accurate to say that China is currently still behind (how far is hard to say) because they have a slight technology handicap imposed by the US.

> There are no switching costs for users to move to a new model.

This depends on how many proprietary APIs are in the way of the model itself.