See what happened in Back to the Future Part 2: https://en.m.wikipedia.org/wiki/Back_to_the_Future_Part_II#R...
This is not the point, as stated by Ms Johansson's statement, her own friends could not tell the difference which is the point. If a reasonable person cannot tell the difference, there is none. In combination with seeking a prior agreement to use her voice this sounds quite dubious at best, malicious at worst.
ChatGPT using Sky voice (not 4o - original sept. release): https://youtu.be/JmxjluHaePw?t=129
Samantha from "Her" (voiced by ScarJo): https://youtu.be/GV01B5kVsC0?t=134
Rashida Jones Talking about herself https://youtu.be/iP-sK9uAKkM
There's a nice comparison here. https://www.reddit.com/r/singularity/comments/1cx1np4/voice_...
I bet OpenAI took it down for the free PR, when life hands you lemons...