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.