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.
Sounds truly, womens are more have got used to safety actions, and cryptocurrencies - absolutely other sort of activity. They would come in this world if bitcoin and other altcoin would become legal and less volatile, and as safety as it can be.