Why would you assume that? The portals have been around for years, and he's seemingly the first one to become a "Player". Why would they think another one would just get picked? It could be an event that takes years to happen. Or might never happen again.
No part of this system gives the impression that it's built with fair game design in mind. Just because it has the trappings of a video game, doesn't mean one should assume it's built like a video game. This could be designed by some malevolent extradimensional AI that's doing this for it's own amusement.