I don't believe this is an un-solvable problem. I do think that having closed lists/groups where this can be made public is also an option - like say, Female Founders group. People can also be encouraged to share the experience and the judgement can be made by those reading it.

It is useful data that, unfortunately, too few of us are aware of, and are thus condemned to the same fate.

I am fundraising, and wish I knew which sleazy firms/investors to not waste my time with.