Adding a new person to those allowed in the car would require a password and a 24 hour wait.
This security system would prevent car theft including carjackings.
So why hasn't this been done already?
If you do live with that kind of fear of violent crime in your life, I legitimately offer you my deep sympathies... I've had the privilege of living most of my life in physically very safe places, and I can only imagine how awful this would be.
That said... Individually authenticating passengers in the car would require some extensive, invasive technology. I cannot imagine an effective way to do it... Here in the US, people convicted of drunk driving are often required to install ignition-interlock Breathalyzers as a condition of keeping their driving privileges. But even those systems are pretty trivial for a somewhat determined problem drinker to defeat.
Also, the major loss of functionality (giving rides to people on short notice) would make it a hard sell, except in place where the crime problem was truly terrifying... And at that point, I'd assume that it's easier/cheaper to just hire armed bodyguards to escort you, rather than any kind of technological solution.
https://en.wikipedia.org/wiki/Symbionese_Liberation_Army
who probably stole at least 5 cars for each bank that they robbed. If you avoid luxury cars your carjacking risk is low. Back when carjacking was big in the media in the 1980s my high school science teacher and I imagined that they'd make cars that were really nice on the inside but looked like crap on the outside to deter carjackers.
(1) https://www.cbsnews.com/chicago/news/cook-county-sheriffs-da...
(2) https://chicago.suntimes.com/crime/2021/12/31/22848890/chica...