If someone clones a random person's voice for commercial purposes, the public likely has no idea who the voice's identity is. Consequently, it's just the acoustic voice.
If someone clones a famous media celebrity's voice, the public has a much greater chance of recognizing the voice and associating it with a specific person.
Which then opens a different question of 'Is the commercial use of the voice appropriating the real person's fame for their own gain?'
Add in the facts that media celebrities' values are partially defined by how people see them, and that they are often paid for their endorsements, and it's a much clearer case that (a) the use potentially influenced the value of their public image & (b) the use was theft, because it was taking something which otherwise would have had value.
Neither consideration exists with 'random person's voice' (with deference to voice actors).
* Defined as 'someone for whom there is an expectation that the general public would recognize their voice or image'