Not everything needs to exist to serve a huge user base. If you bother looking at the archive.org capture linked elsewhere in this thread, you'd notice that this looks like a small little "fun" project hosted either by someone or a small group of people. They probably expect a certain level of traffic on average and planned accordingly.
So for them to go down one time because of a massive influx of traffic (something that is statistically very common to happen to sites of this size linked to from HN) and then have someone jump all the way to asking whether or not they even have "the business" existing?
Yeesh. Chill.