In my opinion, glitches or easter eggs in offline games can be exploited indiscriminately, and cheat codes can (ethically) be used not for bragging rights, like "Hur, I beat sephiroth in three turns, hur" but only either
1. if you are trying to do something specific to advance to a part of the game where the cheat will not be used, or
2. if you are trying to beat the game just to see an ending without having to spend 60 hours of replay time. (either replaying, or on a different save file from your main game) (this reason can also be used for gameplay related spoilers, under some conditions)
Easter eggs may be used indiscriminately in online games.
Glitches and cheats are never*10^163 to be used in online games. It ruins the game for others.
The console/offline games ehtics are my own opinion, but the online ethics are just basic courtesy.
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