so let me get this straight
We don't consider it a "clean room rewrite" if a human who has previously worked on a codebase and has clearly learned how something is supposed to work does a full rewrite, even if the code looks different, right? Because it's basically a derivative work?
But if the code is laundered through a plagiarism machine instead of a human, we're golden and we can disenfranchise any past contributors who expected their code to be distributed under a certain license/attribution?