i believe part of the reason could be that men tend to be more aggressive and women tend to be suppressed. there is also the notion that tech in general is a man's field and also safe spaces for women in the blockchain world have not been created. also there needs to be more role models so that other women can aspire to be like them.
I think you are right.
Actually we can not have very accurate statistic mentioan men is more than women in cryptocurrency but i have optimist that its really true.
I think more men is interesting rather than women.