How exactly would these women prove their case? From what I've read it seems like their case doesn't have any actual "smoking gun" like an email from one of their bosses saying they weren't promoted due to being women.
All the "evidence" seems to be someone thought that they started at too low of a level or they weren't promoted when they felt like they should have been.
In cases like this do you launch the lawsuit and then demand google hand over data so you can find what you are looking for? Or are their belief's/accusations enough to go to court with?