Re-read my second paragraph. Your current vehicle is not capable of drivetrain OTA updates and can't be bricked remotely. Infotainment updates only on your Ram.
Newer vehicles *do* have drivetrain capability. Stellantis accidentally bricked some Wrangler 4XEs. See my more in depth thread here:
https://www.ramforum.com/threads/ota-update-bricks-jeeps.220641/
The real danger isn't the US gov't shutting down vehicles, there's so many steps that have to break down to get there it's not a realistic concern at this point. Your concern the "government just calls the manufacturer" is based entirely on ignorance of legal process. These companies aren't going to slit their economic throats at a request. They won't give law enforcement information without warrant/subpoena. Businesses are so gun shy now places like Wal-mart want a warrant for surveillance video of public areas if the business isn't the victim. I work Homicide, and have worked joint operations with federal agencies for organized crime, I deal with this routinely.
The real danger is bad actors (slim chance) or the upcoming regulations where your vehicle must monitor you for intoxication or distracted driving. Congress already mandated the study but there's no conclusion on what the vehicle must do yet. It is entirely possible that the vehicle will pull over on it's own if it thinks you are sleepy or drunk. Then it's a computer making the decision with zero ramifications. See the link in the thread above.