I'm not sure how much you currently legally own imitations of your own voice. There's a whole market for voice actors who can imitate particular famous voices.
When those imitations are commercialized, there is a disclaimer that a celebrity voice is being impersonated, and parody is a legally protected form of speech. OpenAI is not parodying anything, and failed even the low bar of having a disclaimer.
https://en.wikipedia.org/wiki/Sosumi
Or
https://www.reddit.com/r/todayilearned/comments/9n44b6/til_t...