As a recent example Baldur’s Gate 3, Andrew Wincott voiced Raphael, an npc-antagonist, who to my untrained ear sounded exactly like Charles Dance, and the character model had more than a passing semblance to Mr. Dance as well.
It was not a Charles Dance carbon copy but all aspects of the character were strongly aligned with him.
I’m wondering where is the line in style and personal aspects of one’s craft drawn.
Some of this is probably part of personal perception.
In this case, the actress selected for OpenAI was clearly selected for similarity to SJ. And that by itself would have been okay, because the actress is speaking in her natural voice, and SJ doesn't have a monopoly on voice acting...but OpenAI went further, and had the unknown[1] actress base her inflections, cadence, and mannerisms on SJ's performance in the movie Her. And Altman even tweeted the movie's name to advertise the connection.
The problem is that there is a well-settled case law stretching back over several decades that makes this a slam-dunk case for SJ, because it doesn't matter that OpenAI didn't "steal" her voice, they stole her likeness.[2] It wasn't just some unknown actress speaking in her own voice, it was an actress with a voice similar to SJ given lines and directing by OpenAI with the clear intent of mimicking SJ's voice performance in one of her more-famous roles.
[1] There is a very short list of a few actresses who both sound like SJ and do voice-over work circulating around Hollywood, so a lot of people have a pretty good idea of who it is, but nobody will identify the actress unless she identifies herself, out of solidarity.
[2] Likeness rights are quite strong in the U.S. They're even stronger in Europe.
WaPo's reporting states that the individual in charge of the interaction, Jang, modeled it after Hollywood movies, and worked with a film director specifically to accomplish this goal. And the executive responsible for the artistic decisions, CTO Murati, was conveniently not made available for WaPo to interview.
OpenAI has no credibility here, given its extensive history of dissembling as a company. If Her and SJ weren't the driving inspiration for the Sky voice, they would have made Murati available to explicitly refute those claims. Her absence speaks volumes.
And OpenAI dropping Sky immediately speaks even louder. It means that somewhere there is a smoking gun that would destroy them in court. [Edit: it turns out the smoking guns were already public: in addition to the CEO's Her tweet, his co-founder Karpathy explicitly linked the voice product to SJ. Game. Set. Match.]