People keep mentioning science fiction that this type of thing has been done in. Quick reminder since no one actually watched Caprica that this is how the Cylons started. Daughter of a dude who made a digital scanning technology to create VR avatars makes it better and her avatar becomes sentient. She dies as a suicide bomber and dude discovers the avatar and tries to bring his daughter back by building it a body. It becomes the first Cylon and humanity is extinguished from that particular solar system. The second Cylon turns out to be Admiral Adama's older sister who was also killed in the same suicide bombing.
In any case, it's worth remembering that in reality people are more than what they write, speak, and otherwise ever put into language to communicate to or record for others. I imagine this particular tactic would not work well for me since I have sent single digit SMS messages in the past year and presumably nowhere near six figures as a lifetime number. You'd have to find some other source of writing, but I don't know what that would be. I'd guess at least 90% of the comments I even compose for Hacker News end up being deleted without ever posting them. Turning what I make public into a copy of me would give you a heavily censored, curated image of a fake person who is far more coherent and kind than the real me, and he would also seem to know everything since he's very good at web search. Really, I am quite surprised even reading old forum posts of mine from 20 years ago that I manage to track down, in part because of how much my personality and opinions have changed since then, but also at the impressive way I was able to digest and spew so much basically correct as far as I can tell information into coherent arguments even though I don't think I understood very much of it and remember even less.
I'd expect most Hacker News posters to buy into the obvious truism that what you see on Instagram is not real people but that is equally true of text. Doing this kind of thing at-large risks creating simulacra of perfectly curated uber-humans that would make real people supremely inadequate. We're already going through a mental health crisis exacerbated by people feeling they can't live up to social media personas.