Kong is in RPO; because he is a symbol of pop culture entertainment.
Also, as said..It's a Spielberg film based off of an Ernie Cline book that has as much fan service (more than, probably) than Who Framed Rodger Rabbit.
That said..
..to ask, why does this have to be brought up, when we can talk about Reign of Kong itself? Or is it just the fact that you can't go on it causing this feeling to harp on the Legendary/Warner films more than what Universal tried to do.