Bitcoin investment, knowledge and all whatnot may not be physically exhausting but the mental ability put into it for anyone interested in it isn't a joke. Women don't like what will stress them that much. Learning about Bitcoin is complex and technical. Again, Bitcoin started out with a lot of misgivings and misinformation as a scam. Thus, many people steered clear of it; majority were women. Till date, that misconception hasn't completely cleared in people's mind. Men can easily stomach loss but it's not that way with women. Women are often emotional around stuff like this. I think the loss part of this industry may not be what women want to deal with.