Not to mention the sound would sometimes lag behind my typing (I only wrote three sentences until I had to close the tab), which sounds somewhat similar to scraping your fingernails down a chalk board, only with more bass.
The point is when I click a link titled "Distraction free writing", the very last thing I expect is to hear clicking noises until I refresh the page or wait for the intro to finish.
It would be like test driving a "distraction free car" that starts with the radio on full volume. Sure, you could turn it off, but why is it on to begin with?