Zuckerberg: Yeah so if you ever need info about anyone at Harvard just ask. I have over 4,000 emails, pictures, addresses, SNS
[Redacted Friend's Name]: What? How'd you manage that one?
Zuckerberg: People just submitted it. I don't know why. They "trust me" Dumb fucks.
This exchange was from 2004, when Zuckerberg first launched Facebook from his college dorm. Facebook has never pretended to be anything other than what it is, people keep giving it their information, and then they make a surprised-Pikachu face and complain when Facebook does exactly what they've always done with it. What Facebook said they would do in the TOS that they agreed to.
Dumb fucks.
I'd be very interested in those results too, though I'd want everyone to bear in mind the possibility that the brain could have many different "masculine" and "feminine" attributes that could be present in all sorts of mixtures when you range afield from whatever statistical clusterings there might be. I wouldn't want to see a situation where a transgender person is denied care because an AI "read" them as cisgender.
In another comment in this thread I mentioned how men and women have different average heights, that would be a good analogy. There are short men and tall women, so you shouldn't rely on just that.