My take is that it stems from the way we chat with others online, where we might be freer with our formatting as we type out messages in IRC/Discord/wherever. I

My take is that it stems from the way we chat with others online, where we might be freer with our formatting as we type out messages in IRC/Discord/wherever. It's meant to convey "down to earth"-ness or speaking plainly, which I find fitting given the content of the post.