This site doesn’t actively discourage anyone from participating. Why on Earth would we want to expend time and energy encouraging a certain section of society to join in? That’s like deliberately hiring a certain ethnicity for a job to “show diversity”, it makes no sense unless there is already some form of discrimination happening.
The site is easy to find and not connected to anything that discriminates. I’d guess that the majority find it through Star Wars, which is currently focussed more toward a female point of view.
It’s perfectly okay for groups of people who share similar pastimes to all share the same gender. Read any thread on this site and you’ll see there’s as many different viewpoints as you’d get from any random sampling of mixed gender discussion.
Not everything is lacking simply because it doesn’t feature all kinds of everything.