Sure, with the money involved, there is some private companies. I worked for one you named. However, startup scene will always have government focused entities

Sure, with the money involved, there is some private companies. I worked for one you named. However, startup scene will always have government focused entities and therefore non-government specialized VCs (like YC) probably don't see juice worth the squeeze to try and find a few diamonds in the rough. As for talent moving to companies doing interesting impactful work, I'm not sure I see it. Tech people moving into area seemed to be drawn by government work so they are gone. Home grown tech workers are mixed bag of which I'm one. Some followed their parents and join the ranks of government employees/contractors. Others did find private employment. Really good ones seemed to depart the area. I wasn't really good one, I just moved for my partner.