Wow. I used to do this with drawing (I would just re-draw mangas like Dragon Ball and Battle Angel Alita) and I did this with French writing as well! Copying long paragraphs from Albert Cohen and Flaubert because it was so damn good I just wanted to absorb their writing as much as I could. That process was pretty slow though, I would read a sentence multiple time and try to write it. I just tried this app with Gatsby and the first chapter and I felt like I was absorbing less as I was typing too fast (~80WPM)