Something like this could be incredible for those people. A natural sounding alternative to text to speech for people who dislike how they sound.
And it could also be used to anonymise people in documentaries about serious topics (like say, organised crime) without actors, letting people bring the atrocities of said folks to light without need to trust others or the risk of being found out.
Other examples could include vTubers, artists creating characters for TV shows, films and video games, etc.
All technology can be abused, and sadly with how humanity acts, like will by a small percentage of the population. But for every person abusing it for dubious purposes, there are dozens or hundreds or thousands of others who can make the world better with it.