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...
Is there a distinction?
Are they trying to make it sound like Her, or SJ? Or just trying to go for a similar style? i.e. making artistic choices in designing their product
Note: I've never watched the movie.
Your argument may be stronger if OpenAI said something like “the movie studio owns the rights to this character’s likeness, so we approached them,” but it’s not clear they attempted that.
As to whether she owns the rights of that performance or somebody else, we'd have to read the contract; most likely she doesn't, though.