Because anyone can buy any unused domain name they can invent and point it to any web site they want.
Somebody thought it was funny enough to be worth the few bucks.
Domain name owners can easily mask their identities, but that’s not the case with National Security Agency: the individual who registered the site in 2002 was listed in publicly available domain registry information as John Fenley of Provo, Utah. Fenley explained in 2009 he chose to forward the National Security Agency domain (which he had purchased years earlier) to the NSA’s web site on a lark, nothing more, and had no connection with that agency:
This is why:
https://www.quora.com/Why-does-itanimulli-com-Illuminati-spelled-backwards-go-to-the-NSA-National-Security-Agency-website