I've personally met more women into vtubers as a whole than men. Though, I've met a lot more men who exclusively watch a single vtuber to an almost obsessive degree. This probably has its roots, like most things in the scene, in Japanese idol culture. At least from what I've seen, women are more likely to enjoy the entire experience surrounding the industry instead of just a single idol or group
Also, this completely ignores the small but not insignificant minority of male vtubers
This is a very tired insult/joke outsiders throw around about vtubing (though I don't get the impression that you had that intention). It's somewhat ridiculous, vtubers stream very often and voice changers tend to be pretty obvious. There are some men who use female avatars, but it isn't common.
It's also kinda misogynistic, plenty of women enjoy anime culture. Many prominent artists for vtuber models are also women (and occasionally vtubers themselves). To the level that calling the model artist "mama" and the model rigger "papa" is a common trope.
Hentai porn is apparently the most popular porn category in lots of countries! Took me by surprise when I found that out. Closely followed by the more predictable “lesbian”, “Anal”, “MILF” and “Asian”!
Also, this completely ignores the small but not insignificant minority of male vtubers