To sue someone for doing something illegal, you first need some evidence that they're doing it. Google heavily employs confidentiality for that reason. Case in point: Antitrust investigations across the globe were launched into the Android MADA... but that didn't happen until years later, when the confidential agreements were revealed in the Oracle v. Google case.

As long as nobody knew what was happening, it went unpoliced. One of the ongoing HR-related lawsuits explicitly claims Google prohibits employees from revealing illegal conduct that the company engages in.