I suppose the old "idkfa" code for Doom was fine in it's day. They were put there for discovery, and for crap players like me (then) it was the only way to see what the rest of the game was like
But those only applied to single player games - it affected nobody else, and was actually a mechanism of the game straight from the designers.
These guys are just cheats and hackers. To do so in a game that you share with others puts you (effectively) into a completely different game. If you do it - don't then spread the poo. Keep it to yourselves.