I mean, I know they're pretty much gone. And I can probably hazard a guess as to why. But still, cheating in video games was a big part of my childhood. I still remember the codes for God mode and infinite ammo in Doom (IDDQD and IDKFA, respectively).
Even if a game didn't have official codes, there was always Game Genie. Aside from allowing you to beat games that otherwise were impossible, they also allowed you to mess around and do crazy things that extended your enjoyment of the game much longer. I don't predict cheat codes ever making a return, but I would love to see them in more games again some day.