"What makes mgotws scarier for women?"
At the very base of this, the fear by feminists, and those women that understand what MGTOW actually represents, is that women will NOT have the option to latch onto a man to be taken care of as more men opt-out of the system that allows women, in a care-free manner, to accept all the benefits of men's labour ..either directly or from the redistribution of taxes... without question.
Feminists keep trying to shame MGTOW's as gay, or "unmanly", by making it seem like a group of men that just don't want to interact with women. But the reality is that MGTOW is men that are opting out of the SYSTEM that holds men to a higher Responsibility both legally, and socially.
So when enough men opt-out of that system, there will not be enough resources for society to exist the way it is, and either everyone else will be squeezed into picking up that increasing slack, OR there won't be enough men and willing, or capable women around to keep civilization going. This means a collapse and a reset, with all the ugly anarchy type stuff in the middle that no one wants to talk about.
THAT's the fear. Not the ridiculous framing of the argument by feminists that are just attempts at shame.