Even if thats true why would that be illegal or unethical? She can't possibly have a copyright on all voices that sounds like "her"
[0]: Though not necessarily "copyrights"?
[1]: https://higgslaw.com/celebrities-sue-over-unauthorized-use-o...
If what OpenAI is saying is true, then none of the conditions apply. I'd say (1) is unlikely, (2) is very unlikely, and (3) is maybe, at least to some degree.
Very little suggests an intent to confuse more than tweets from company leaders confirming that there was intent to confuse. What is left on the table is whether actual confusion occurred, which is different.
Still, this isn't recognized in every state or country, and there aren't many cases yet (although there are laws).