> Google copied them so they would get access to the large developer community and ride the coattails of the successful investments into the Java platform that Oracle made.
I like this framing and think it’s entirely correct, but I don’t agree that it necessarily dooms the interoperability argument.
Google wasn’t trying to achieve compatibility with existing code (for which, you’re right, they’d have needed to take the whole set) but rather compatibility with existing developers. Arguably, that is still interoperability.