Have you heard about the recent controversy of copyleft-washing? Some folks are making alternatives to free software and releasing them under a lax, permissive non-copyleft free software license. In order for this to be legal, it must not be a derivative work, so the publishers will often claim it is a "clean room" re-implementation.
By way of example: https://github.com/chardet/chardet/issues/327
Now somebody has packaged up that process as a delightful satire website. https://malus.sh


