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Yeah but nobody will spend time and effort to send a bad dice to a casino, because the casino can easily detect if their dices are not good.

But if the dice is used to generate electronic entropy, then someone might boot up a supercomputer and search for autocorrelation in your BTC public key that had bad entropy. it makes your public key less secure, and why would you want that? It could be vulnerable against quantum computers when the come out.

I just finished that article you might want to read it: https://steemit.com/bitcoin/@profitgenerator/tutorial-generate-bitcoin-private-keys-securely