I don't know what their motivation is, but I definitely hope they protect the identity of the voice actress. If her name gets out, it's basically guaranteed her life would suck for a while.

If she's like 99% of actors, she's someone just struggling to get work, who's lucky if she can afford to rent an apartment without roommates. If her name got out, she's almost certainly have to deal with death threats, stalkers, etc. Rich celebrities can deal with that kind of attention because they have the money to hire security people, PR people, lawyers, etc. Some random voice actor is not going to have those resources.

respect for privacy

Sure, bud

And that’s both fine and valid.

If an actor was hired, I could see them being treated as a scab or not being offered roles - perhaps because they agreed to take a job that they had no idea would be used in such a way, or with no idea that a controversy would emerge.

I am dubious, though. It seems that OpenAI pulled the voice shortly after Johansson’s legal team requested information about how the Sky voice was created.
It’s a fair assumption that I’m biased - and I am. I’m not the biggest fan of ‘big tech.’ So perhaps I’m not as objective as others.

But I think the voice actor part is still minor. It’s not just the voice, it’s the character, and all the references to the movie, which I think were intended to deceive consumers and create false sense of endorsement.
Or maybe not, maybe it’s that Sam Altman is a man-child with a crush on Johansson. He’s openly said that Her is his favorite movie, and it’s not a leap to see a CEO cowing his staff into bad decisions.

Ironically, a similarity to a real, live person without an agenda is not a legal problem unless there’s an implied endorsement from the person. (Which I think was one of the goals here.)
But characters in movies and books are subject to copyright and are considered the intellectual property of the rights holders.

So like, if I wrote a book about Wolverine and used other Marvel X-men, Marvel could sue the shit out of me. Or if I used AI to create Hugh Jackman (as Wolverine) to endorse my bandaid product line, I could also be sued by both Jackman and Marvel.

I think it’s obvious here that Sky was intended to represent Sam from Her, and is almost certainly trained on her voice data (which is copywritten). After a few days thought however, I’m less certain of the argument this could be seen as a false endorsement scheme, since Johansson isn’t mentioned anywhere. (Despite the character being solely played by her, and the numerous attempts to have Johansson work on the project in an official capacity.)