It does have actual genuine uses. I'm in the process of recording a series of tutorials for my peers but I'd like them to hear things in my voice so it doesn't sound like I have offloaded the work to someone else.
I don't know if this helps or harms the credibility but I can't really talk more than an hour without seriously straining my voice. So cloning it sounds like a great use-case for someone with a similar problem.
Looking forward to trying this.