There's a whole company/llm about doing that whose CEO gave a Ted talk about it.
https://m.youtube.com/watch?v=-w4JrIxFZRA
After that, I actually had a pretty wild idea about someone using to replace dead/missing people in chats. Imagine the horror of finding out your friend died months ago, or got kidnapped. Horribly impractical but sounds like a good novel.
Nah fam he ran out of luck for his lifetime