I don't believe it is a very popular story so that might be the reason.

It was popular enough for me to have known about it before I saw the emoji.

Why is there even an Emoji for the book? Does it come up that often on hexchat?

Because the Hexbear creator of emojis decided it'd be fun to add it, and it was almost immediately used to summarize bleak and terrible future outcomes, especially in reference to this moment mocking the tendency of tech billionaires to miss the point of the fiction they consume and make announcements about how they want to make the bad things in such fiction come true:

https://i.kym-cdn.com/photos/images/original/002/386/548/92f.jpg