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If he didn’t sign an NDA, then this sounds like a bullshit suit.
It could be counted as IP infringement, corporate espionage, copyright infringement, trademark infringement, trademark abuse, and I’m sure various other things an actual lawyer would know.
I hate large companies and corporations, I think Nintendo is extremely horrible with a lot of their practices, especially regarding abandonware, archiving, and emulation, but when someone commits various crimes, especially unapologetically and without a just cause, they’re still a criminal.
This is a case of a selfish prick of a man being a criminal against a selfish prick of a company.
Edit: oh and of course, piracy. (Sail the seas fellas, just not in plain view)