I'm of the general opinion that people should be free to make their own sub-communities, and even within reason restrict access to others. Say women in tech want a male-free space? Well fine.

The issue is, what then about "white men in tech"? Do they get to have a group to themselves, to discuss issues from, dunno, "dealing with tech Feminazis", or whatever white men in tech struggle with? What about white supremacists in tech? Elite SEs against influx of cheap junior labour?

I'm personally not a member of any such "selective" groups and for these reasons feel a bit ambivalent about them.

But as i say, go ahead as far as I'm concerned...