Right, except they didn't. The roguelike is a genre with a particularly illustrious history, and NetHack is especially glorious for, in all the field of roguelikes, it possesses the DevTeam and The DevTeam Thinks Of Everything. Diablo didn't appropriate NetHack - with its wild and wonderful menagerie, its many and varied terrains, its object-verb completeness, its dungeons that fork and separate - it appropriated Rogue.
Why would you dink around with the inappropriate roguelike reference? Because you post to Quarter To Three!