But really, relicensing a GPL codebase to MIT is uninteresting.

Let's do the interesting one, which is: vibe code a "clean room" reimplementation of an entire proprietary codebase! After all, Microsoft released a "shared source" proprietary version of Windows. Now try seeing what happens if you run THAT through the "turn it into public domain" machine

Win-win outcome, no matter how it goes

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