I think because that people believes that women has other center of interest like cooking or makeup or children elevation so it is possible there are women registered with male email address on youtube this could be also case that 100 % of audience are male, all possibilities are possible. This is because for a small reason; if a men is selling crypto or earning crypto all orders are serious while it differs for a women because there are people calling just for wasting her time so there are other manners of selling crypto like for example her brother reply to phone calls.