Can you please elaborate on why distributing decompiled source code is violating copyright? And Nintendo is litigious, if it was black and white surely they would have taken down everything by now? How do you know the major LLMs are not trained on these decomp projects and/or leaks already?

Because it is clearly a derivative work. The very fact these projects strive to be byte perfect shows that they want to be a copy of the original. These people are not creating a new original work which happens to be similar to a game.

>Nintendo is litigious

But they don't go after every copyright violation. They have a few categories of violations that they focus on. For example go to YouTube and search "pokemon music" and you'll find an endless list of copyright infringement. This doesn't even include the videos people make using pokemon music as background music.

>How do you know the major LLMs are not trained on these decomp projects and/or leaks already?

It doesn't matter since the risk of it being an issue is low.