Is someone's voice their IP? Is it more-valuable property because they are famous? What type of IP? Trademark? Without their name and image in combination, is a voice/likeness actually defensible? Training a computer to have any actual-human sounding voice is likely to almost match someone's voice. I haven't taken an IP class since 2004, but I'm not sure if there's a real case here is there?
“My fellow gamers…”
But what if it’s worse than just video tutorials, something vile? You simply wouldn’t want to have your voice associated with that.