[Reubachi]

I work in CA/PKI, particularly IOT device registration/security via TPM keys.

I cannot imagine a scenario after years working with our own infra and clients where a car manufacturer would restrict access to the vehicle with a private key decryption on the FOB tpm, (that can't be exported or copied.)

Lost/broke fob? 4000 pound paperweight, to no ones benefit. Insurance nightmare that would also be violating right to repair in many states (which is a different issue) .

There SHOULD be a standard like every person has some device or process that is also a CA, who can then generate and dictate what keypairs can access a device, car etc. But we are very very very far away form that.