The whole talk about subsidies is pure smoke screen. US automakers have received a lot more subsidies than their Chinese counterparts. The top chinese firm receiving government subsidies, CATL, got ~$500M USD last year. BYD is said to have received $3.5 billion in total in its lifetime. In the meantime, the US government offered $12B just last year for automakers to start making more EVs, and Ford is reported to have received a total of $33B in loans, bailouts and tax rebates.
In any case, if you could put down $3.5B and get a BYD out, everyone would be doing it, reality is a bit more complex than that.
BYD Wuxi workers went on strike in 2021 because BYD was trying to restructure to eliminate overtime, which would effectively drop the workers wage to under $400 USD a month.
China currently has multiple times higher costs than countries like Vietnam. Cheap labour is not a major factor anymore.