If so, I suspect they’ll be okay in a court of law — having a voice similar to a celebrity isn’t illegal.
It’ll likely cheese off actors and performers though.
[1] https://www.forbes.com/sites/roberthart/2024/05/20/openai-sa...
OpenAI has gone the "it's easier to ask forgiveness than permission" route, and it seemed like they might get away with that, but if this results in a lot more stories like this they'll risk running afoul of public opinion and future legislation turning sharply against them.