A few days ago, there was a flash-in-the-pan controversy over Google "forking" Apple's open-source programming language Swift. After a few minutes of speculation over whether Google was going to make its own special flavor of the language for its own purposes, Swift's creator Chris Lattner (who now works at Google) helpfully clarified the situation:
Swift at Google has enough folks working on it that we need a staging ground/integration point, and we decided it should be public. https://t.co/hyphe0KrU0
— Chris Lattner (@clattner_llvm) November 15, 2017
Google just wanted its own working copy of the code so it could make changes and then contribute them "upstream" to the official Swift repository. No funny business.