I already used it.
But it just make no sens to me. It's like if I create a blog with light yellow written over light green where nobody can read a thing and then tell them to use another application to be able to read it.
But to be fair, 6 years ago, my terminals were like that. So I guess this hacker/matrix mode goes away with time.
One nice thing about the web (as opposed to say a book or magazine) is, if you own your blog, you can make its defaults look like whatever you want, and your readers can override that to make it look like whatever they want.