What do you expect? It's a startup-oriented hacker bulletin board run by a guy that suggests that hiring is obsolete and most nerds should be able to start a new venture and make a killing.
Even if it's overly optimistic, it's a pretty reasonable aspiration compared to the wage slavery most have to endure, so I fail to see why this is wrong.
There are plenty more of stories of failure studied at HN than successes like WhatsApp. That's actually more correlated with reality than the mainstream business media that focuses mostly on success.
Still waiting for the explanation of why it's rotten to want to create value through technology and seek reward for it.
One might argue WhatsApp isn't worth what was paid for, or that the money would be better spent elsewhere. But that's a rather subjective judgement. Spending $16 billion on, say, philanthropic causes, doesn't necessarily lead to desirable or sustainable effects. As with any scarce resource, it depends on how the money is managed.