I have mixed feelings about this anniversary. RMS is both the reason that the free software movement is where it is today, and the reason that it has so few women involved. If we could turn back the clock, I wish we could keep the good parts but leave out the bad parts.
the reason that it has so few women involved Citation needed here. Free Software movement at this point is much, much larger than FSF, GNU and rms. Many of those communities (Like KDE which I've been involved with) have been very very welcoming and inclusive to woman. However, woman have always been under-represented there just like many other areas in Tech. Not saying rms has not made GNU/FSF difficult for woman tho…
FLOSSPOLS 2004-05 found that "proprietary software" was around 28% female, whereas "free software" was around 1.5% female. A presentatation of the results can be found at [1].
I agree with you that FOSS is much larger than GNU/FSF, and that many places are actively welcoming to women - the linked slides reference Debian's efforts; the python community also seems to be fairly good at this.
[1] https://people.cs.umass.edu/~wallach/talks/flosspols.pdf