Apparently the Gold Parts are considered Spoilers on Miiverse... <(-_-<)

[episteme]

Einsam_Delphin said:

Yeah I think they said I'd be banned if I did it again. And how is that anymore of a spoiler? That's like saying how every 50 coins unlocks a new kart part is a spoiler! Just cause something's unlockable does not instantly mean it's a spoiler, and definitely not the method!

The method how to unlock a special part is a spoiler in my opinion.