If Tesla's patent on electric vehicles can't be used, can BYD still develop?

I can't. Tesla opened the patent of electric vehicles on a global scale, making electric vehicles advance by leaps and bounds. If Tesla's electric vehicle patent is not used, the electric vehicles in the world will not advance by leaps and bounds, and BYD will not develop. After the opening of Tesla, other car companies were forced to open together. Tesla's open patent has become the biggest beneficiary of its technical route and gained huge commercial benefits.