Oracle attempted to make clean room reverse engineering illegal by arguing that copyright applies to ABIs despite our entire industry relying on that not being the case, all so Larry Ellison could buy another yacht. So yeah, someone continuing to work on Java after it was acquired by one of the most evil companies on the planet definitely is consciously choosing to make the world a worse place and should no longer be employable.

Facebook is also on my personal blacklist, yes. I don't feel as strongly about Google personally, but I wouldn't argue if someone else on the hiring team felt it was disqualifying.