The primary use for those chips is autoenshittification - access to legal strictures ("IP") that allows them to block modifications and repairs that would interfere with the unfettered abuse of their own customers:
https://pluralistic.net/2023/07/24/rent-to-pwn/#kitt-is-a-demon
The fact that it's a felony to reverse-engineer and modify a car's software opens the floodgates to all kinds of shitty scams.
29/