Toyota has 270B debt, Volkswagen 220B, Ford 164B, GM 132B etc.
There's no reason believe there's anything special about US car regulations vs European and other regulations which BYD already passes. BYD sells cars in Europe, Asia, South America and Australia etc. Only tariffs are keeping them out of NA, not an inability to adhere to regulations.
BYD EV cars are fine from my experience, most of them are not TOTL but they have good value for money, pack a lot of technology, have meaningful OTA updates and work well. Their main problem, from my experience, is battery capacity and range which they need to improve.