If an individual creates a RAG over a significant period of time, that contains many of their own voice notes, videos, audio recordings, photos, texts and writing, etc, then this could become the basis for a sort of facsimile of their personality. But also this archive could be used to generate creative work 'inspired' by its contents, for example their biography.
"What if we did psychic mediums but on a computer?"
This simply preys upon a lonely and vulnerable population which needs to process their grief not dwell in it.