Your justification is entirely valid but I still think you should copyright "Spong's rule of mong" just for the fantastic ring it has to it, even if it means reworking it so the rule of mong is, as you say "The only mongs are the people who misunderstood that."
@Mr-Brett I don't see why. I never said anything about a game being shit based solely on its filesize. I merely said that, logically, more is more. Braid is 144MB, but people seem to think I'm mental or fucked in the head somehow for imagining that a 300MB Braid (or a limit-reaching 2GB Braid) would be bigger/better. The only mongs are the people who misunderstood that.