.BITCOIN IS
OPEN FOR EVERYONE AND ANYONE TO ADOPT..its not the men's fault that 0.0001% of women are interested in bitcoin.
OP you stated the summary of the whole matter as the popular saying is stated that you can take a horse to river but can't force it to drink water, as long as Bitcoin or crypto currency is concerned I don't think anyone is ignorance of it because it's information is not hidden, both old and young hears it no gender is exempted.
One thing I see in women is that only few are ready to take responsibility or involve in anything like adventure where little risk is involved, they prefer risk free business or investment some don't even care to engage in anything doing but depends on who supply them with their basic need as woman.
The article you read if truly may not categorically said the the percentage of women is based on the limitations attached that makes them not to participate but matter if how women perceived Bitcoin, involvement of Bitcoin is conceptional and not persuasion if properly evaluate other area of business or investment you also see that women is of less population due to how they perceived life, as that has been their nature.