Selling a voice profile for procedural/generated voice acting (similar to elevenlabs "voices") of a well-known person or pleasant sounding voice could be a legitimate use-case. But only iif actual consent is acquired first.

Given that rights about ones likeness (Personality rights) are somewhat defined there might be a legitimate usecase here. For example, a user might prefer a TTS with the voice of a familiar presenter from TV over a generic voice.

But it sounds exceedingly easy to abuse (similar to other generative AI applications) in order to exploit end-users (social engineering) and voice "providers" (exploitation of personality rights).