reddit has /r/TwoXChromosomes which is one of my favorite subs. It's a general womens subreddit, and though it obviously leans feminist it's not its main purpose. It welcomes all genders, but remains a womens space.
Woman-centered is not an absolute. One does not have to be part of a single characteristic of a group to have a stake in it, to be an ally, an advocate, a partner, a family member, among countless other scenarios.
I would suggest reading up on intersectionality.
By the way, all of this is covered in the subreddit sidebar, including in an FAQ in the wiki.
You need to stay away from feminism and enby activism entirely until you've humbled yourself and seriously sat with how problematic this take is.
You're not helping anybody with that. Least of all enbies/trans people. And not just because it makes us look bad either, though that's certainly part of it.
I don't know how problematic this take is, and since you can't explain how it is, I'm convinced you don't either. You're just having an emotional reaction to deviation from the gender binary's norms, which construct womanhood as the opposite of manhood.
While I do agree with what you're saying, I actually think a "by women for women" instance has a slightly different impact than a "by women for women" community. There are definitely pros and cons for both, though
We used to have an equivalent on our instance, but it was constantly flooded with reply-bros and trans people complaining about the name, so we archived it as no women was willing to moderate it (for understandable reasons).
I wondered if they made the jump over here. Guess not, sadly. Reading that sub has made me a better man, because it offers some pretty harsh critiques of male behavior.