I briefly worked at a tech company making oil industry software in .NET in a Houston suburb. Not trendy, cubicles, but they paid fine (and unlike my current job the office was quiet). I quickly noticed that half of my coworkers were not only women, but a lot were people of color and older (I actually think I was the only person under 25 there). Many were managers too. The idea of inclusivity and outreach was never brought up.
I think the difference is that these companies are, for lack of a better word, more professional. Startups and SV tech companies seem to focus a lot on culture, people, outings, coworkers being friends, etc. The company I worked on just required you to not be unpleasant and do your work.