So, there's a guy Silicon Valley Billionaire named Peter Thiel who released a book back in 2014 called "Zero to One", in which he advocates for the monopoly system and claims any good businessman ultimately seeks to corner the market.
The US car market has been consolidating over the last 40 years, in an effort to cartelize and ultimately monopolize the automotive industry. We've passed a host of regulations and taxes that compel foreign manufacturers to build and assemble cars domestically, to partner with US car firms, and to absorb parts of the market American firms don't want to occupy (US firms have functionally given up making small cars - almost everything is a truck or an SUV now). And we've unleashed our investment banks on East Asian industries, guaranteeing financial control of the largest firms in Korea, Japan, The Phillipines, and Taiwan via our international system of credits and debits.
The goal was never free markets, it was captured revenue streams. As we enter a new high surveillance age, vehicles are increasingly part of the always-on Internet Of Things information network used to continuously monitor anyone with enough money to afford a cellular device.
Excising firms like Huawei, ByteDance, and now BYD from the US marketplace is about cementing that captured state of the American economy and tightening the surveillance network. These are absolutely perceived of as threats, because they don't integrate into our controlled networks. Until Chinese businesses are willing to submit to Five-Eyes surveillance and the Chicago School Economics of the New York banks, they're not welcome in our country.