Should that be illegal, as long as the result isn't described as being the real person? To repeat my analogy, say I want to cover Guns N' Roses. I can hire a guitarist that could copy Slash's guitar parts (but can't say it's Slash playing them). Is that fundamentally different from getting an AI to sing Axl's vocals (as long as I don't say it's the real Axl singing)? It feels different, somehow, but I'm not sure that's philosophically defensible.
Help me think this through. Why are AI replicas that don't claim to be the original different from a cover band or an impressionist?