Gamejack

A website that pretends to be associated with an online ARG (alternate reality game), but is generally spam. These fake websites cause confusion, promote mis-information, and ultimately waste the time of everyone involved.

That website is not related to the ARG, it is a Gamejack.

Gamejack by Chibbie August 20, 2007

Gamejacker 

One who attempts to hijack a game by creating seemingly canon information for it without consent from the author of said game.

Followers of Jadusable's ARG mostly see MHFTT on YouTube as a gamejacker.

Gamejacker by Lady Alzers June 19, 2011