Who knows, perhaps some Hacktivist group will take an interest in this and melt their servers with a distributed denial of service (DDoS) attack. Perhaps that is what was going on when the writer of the article found that the site was unavailable.
Putting aside moral and ethical questions (which are substantial), the site may make advertising revenue if it can survive. I just hope that talent acquisition entities will take the high road and not look there for information about prospective hires, but how could some of them resist?! They would just tell themselves that they will take what they find with a large grain of salt, smile, and dive in.