Intent matters. There's enough evidence out there pointing out to OpenAI's intention to copy Scarlett Johansson's character in "Her". The voice actress could read literally the same lines with the same intonation for (say) Facebook and, as long as she wasn't coached to sound like Scarlett Johansson, it would be fine.
Suppose you turn down a job offer as a programmer. Can you be pissed at me if I offer the job to someone whose code looks like yours based on scraping GitHub?
"Impersonation of a voice, or similarly distinctive feature, must be granted permission by the original artist for a public impersonation, even for copyrighted materials."
Having someone sing in the exact same style as another singer is totally different from what OpenAI did with their voice AI (having a female actor speak in a flirty tone).
It makes sense with music but you're setting a really dangerous precedent if you can't even hire a voice actor who sounds similar for speaking.
