they don't have NHTSA certification which makes them illegal to operate on public roads

also:

Connected vehicle ban and national security rules

Here’s a newer twist: the Department of Commerce’s “Connected Vehicles Rule,” effective January 2025. It bans import or sale of vehicles containing Chinese-origin software or data systems—think Huawei chips, ADS, or infotainment modules. Roughly 90% of Chinese electric cars fall into this category. The logic? National security. The government doesn’t want your car phoning home to Shenzhen. Even used EVs built after 2020 risk being flagged under these restrictions. Only stripped-down, low-tech models—like neighborhood electric vehicles (NEVs)—might sneak past. But forget using them on highways; they’re limited to about 25 mph (40 km/h).