Um, no? It works in non-adversarial environments. Such environments are rare in today's world but they still exist, mainly where there isn't a profit motive. Believe it or not, there are still some people in the world who believe that there is more to life than money.
> Believe it or not, there are still some people in the world who believe that there is more to life than money
Do they use page rank?
We are talking about web search.
No, we are talking about Page Rank, which is an algorithm on directed graphs. Web search is one application, but not the only one.