lemmy.blahaj.zone has a decent amount of women and both their admins are women, it’s not a “women’s space” as one would describe since everyone is welcome there but it’s probably the closest thing one would describe as an instance “by women for women”. I am obligated to mention that it is a queer instance and that many of the women there are either trans themselves or strongly supportive of trans people, and do not tolerate transphobia or anti-LGBT sentiment (including refusal to support LGBTQ people) at all.
As much as I appreciate the community and users at Blahaj, in my personal experience, the moderation was fairly wanting. At least a year or two ago (not sure about now), they tolerated some pretty freakish right-wing people who enabled chasers and other weird shit on their communities.
We all pretend that it didn’t exist and do not acknowledge its presence; that’s the informal rule.
Yeah Spinster is generally considered a hate site, and consequently is very widely defederated, even from general purpose instances like lemmy.world. Also it’s less of a Reddit alternative and more of a Twitter alternative but is technically redundant since you can do everything you did on there on the real thing instead.