Well of course as you pointed out the legitimate one would be copying voices WITH permission (yours, someone you know who gives authorization, through contracts for movies/bots etc). The model can’t differentiate between voices for which you have permission or not.

But more generally while recordings might be copyrighted, the voice itself isn’t so copying a voice isn’t a crime, at least as it currently stands. You cannot however use said voice for deceptive practices. You can however for advertisement (needs permission). And in the US you can for satire, at least in the US, withOUT permission (falls under the 1st amendment).