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Being a blockchain would give exactly zero advantages over a traditional database.

yes it will. Because in a block chain, you can't change anything unless everyone agrees to it.

If you change that code, and place it back in the block-chain no other block will agree to your change and reject you.

As the game developer, I do not care if anyone else agrees to it. I am the ultimate authority. Thus, I don't need any kind of blockchain.

You seem to have several misconceptions about computing in general. This is not how any of this fits together.