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 co-founder of Equi Capital, Michelle, a lingerie tycoon is one of the role model of a woman in business and in blockchain space. There's few role models nowadays, but in the future you'll see more woman in the blockchain space. And please, don't tell your wife or girlfriend about your private key.