If you're selling or publishing a voice in a way that impersonates another person without their consent that may be identifiable and prosecutable. "Generate with x voice." 'Talk to x." Etc. Exact lettering is no necessary if intent is evident from pictures or evasive descriptions making an obvious implication.
If prosecution can find evidence of cloning/training that can also serve as basis.
In these ways it doesn't have to be about similarity of the produced voice, of quality or alternative people, at all.