Comment by yongjik

As others said, much more than 10% of Google's engineers don't even own an Apple machine. So, even if Google's Mac management team somehow uses Homebrew to manage the employees' machines (which may or may not be true: I have no idea, even though I used a Macbook in Google until recently for years), the percentage of Google engineers using that software is nowhere near 90%. The percentage of Google engineers knowingly using that software is certainly closer to 10% than 90%.