The stolen cars were model years less than 2022 and were trims that needed a key to start the vehicle. Models that's used pushed button starts were unaffected.

You can see all the models affected and rollout of software to address it here: https://hyundaiantitheft.com/

A number of things including some insurance companies refusing to insure kia and hyundais. People wont buy your cars if they can't use them!