> APIs may be copyrightable
replyDidn't Google v. Oracle disprove this?
Not quite. Google v Oracle ducked the question of API copyrightability (that was one of the main complaints of Thomas's dissent), instead saying that Google's use of the APIs were very definitely fair use in a sufficiently general manner that any clean room implementation of API for compatibility is very definitely fair use.
replyIt is not proof. It is a clear derived work infringing on the copyright of Nintendo.
replyDepends of the country, a lot of countries have exceptions for interoperability (at least the whole EU) and since these projects are mainly used to make ports to other systems, it may be covered.
replyThis is an absolutely ridiculous interpretation. There is no interoperability here at all, you are literally just copying the work in question.
replyIt is like claiming that compiling Samba to run in $NEW_PLATFORM suddenly strips Samba of the GPLv3.