Why are the later email exchanges in this post documented through embedded tweets of images of text? On mobile most of the images are cut off in this display fo

Why are the later email exchanges in this post documented through embedded tweets of images of text? On mobile most of the images are cut off in this display format, requiring readers to click through to Twitter to read each one of them. I don't really understand why people do this when they can either embed the image directly or just copy-paste the text.