In contrast to the US, South Korea, China and Japan actively have laws in their federal code against using AI voices for profit without the consent of the people/persons the LLMs will be trained on, so none of this is an issue.

I can almost guarantee you that they all gave consent for their performance to used in what ever manner the studio saw fit. They just didn't know they had because, "sure you have the full rights to this performance," meant something different in their minds when they signed their contracts years ago.

a traditional actor, such as Mark Hamill

Mark Hamill is a voice actor whose one notable live action role was over 40 years ago.

In contrast to the US, South Korea, China and Japan actively have laws in their federal code against using AI voices for profit without the consent of the people/persons the LLMs will be trained on, so none of this is an issue.

I can almost guarantee you that they all gave consent for their performance to used in what ever manner the studio saw fit. They just didn't know they had because, "sure you have the full rights to this performance," meant something different in their minds when they signed their contracts years ago.