Probably building them so they don't have to use American parts. What's funny is that everyone claims that no one wants decoupling. While at the same time, everyone is also taking measures which are at once, very rational, and lead inevitably to a decoupled world.
I'm just saying that the amalgamation of rational actions on the part of everyone involved has the potential to lead us to the decoupled world that everyone claims they don't want.
Of course China should fund their chip industry. It's common sense. Long term, they should probably be using their own chips. Also common sense. But imagine the same common sense being applied across the economies of all great nations in every critical sector. Think about where such measures lead in terms of global trade.
Maybe it's good? Not saying it's a definite bad thing. I'm a dad, when my kids were younger, if they couldn't get along I made them take their things and go back to their rooms. I have to admit, that made for a much more peaceful house. I'm just saying that it's probably better for the development of the children for them to peacefully play together.
OTH China invests 95% of GDP on infrastructure (compared to 1.5% in the US), creating a huge domestic market. And a a stop of trade with the US will also mean a stop of China keeping the dollar strong - which they do because their currency is pegged to the dollar. They won't have a reason to continue this practice without trade with the US.