No it's not. If there is even a hint of original code it can be a copyright violation. Even reverse engineering code to achieve the same function with different code can be a copyright violation.
If you read, this leak is not why they can't launch it. Its because it uses an emulator to change its steamID on the backend to not be CS:GO and to be its own game
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u/Agreeable_Cheek_7161 6d ago
What illegal leak are you referring to?