This isn't even about gaming, necessarily.
Girls who code are rare. There are probably more AFAB coders at my work than those who identify as female. And a hell of a lot more men.
And I'm in a progressive city in a progressive state.
I work in IT, and I think there is one woman out of 50 employees on my corner of the org chart, and that's the CIO's admin assistant.
I'm certain it's culture, and it doesn't just go for programming, it goes for almost all of STEM. There was a recent "Stuff You Should Know" episode about toy chemistry sets, and they made it a point to talk about the marketing, and how it always was with boys, for boys. My son, 8 year old kid, says "that's just wrong! Girls can do all that stuff!". He's got it figured out.