I had the same thought, specifically women who work in FOSS communities anonymously and do independent consulting not being counted as much as those at random tech firms.
I don't know, at least in a FOSS community, revealing yourself as a woman seems like a good way to get plenty of help, swift replies, and votes for positions of power. I've seen it before ("Jill for list moderator! She's the greatest!"), but of course that's also a good reason for a woman to remain anonymous--not everybody is cut out for the fawning adoration of 15-year-old GNOME coders.