Reverse engineering and pirating are not the same thing (although the former may certainly be used as a means to achieve the latter). As long as you aren't distributing the game, distributing code that legitimate owners of the game can use to run their game on more platforms is not a crime.

I don't think the "it's piracy to use the code generated by an LLM because it closely resembles the code the LLM was trained on" argument has been fought in court yet.

Depends on the jurisdiction? However usually it is a civil matter not an actual crime..

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