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That this comment is in every discussion of TV tropes is a weird trope in and of itself.

Do we owe this to that Minecraft welcome message? Or is fundamentally one of those self-fulfilling prophecies? .

No. This saying about TVTropes definitely exists outside of any influence that Minecraft may or may not have had.

No; it was already an established meme. Minecraft got it from the wider culture, not the other way around.