Reid Hoffman, LinkedIn co-founder, has gone whole hog on that idea and has a literal AI clone of himself, trained on all his writings, videos and audio interviews -- complete with AI-generated deep-fake visuals and cloned voice:

https://www.linkedin.com/posts/reidhoffman_can-talking-with-...

I've watched a handful of videos with this "digital twin", and I don't know how much post-processing has gone into them, but it is scary accurate. And this was a year+ ago.