I'm struggling to think of any legitimate use cases that actually benefit society. I can only think of nefarious uses for this technology.
I know Hollywood is interested in it for maintaining the legacy of iconic voices in established IPs like James Earl Jones in Star Wars, but I don't think that benefits society overall. It is neat to potentially have his voice show up in future projects, but that feels like more of a gimmick to justify the technology rather than an actual need.