BYD only entered the Australian car market in 2022.
They are now the 2nd biggest seller after Toyota (https://www.msn.com/en-au/news/insight/byd-overtakes-rivals-...).
They are also priced much lower than KIA and Tesla.
FWIW I now own a GWM Cannon Αlpha PHEV pickup. Have also owned a Jeep Wrangler - the tech, build quality and reliability is not even on the same planet.
I can't imagine how the US manufacturers would compete with the Chinese ones on a level playing field. Not from the US, but it's hard to see how any administration would allow that. Would be the end of the local industry.