There is also still a concept of national service in such places. Even as a civilian, some people would rather design systems to protect their county than design systems to support real estate in the metaverse. Do you want to do data analysis to catch terrorists or track international drug shipments, or design another algorithm to better serve ads to elderly people needing regular diabetic testing supplies?
A few months back the US Navy's CTO asked LinkedIn why technically-talented people were leaving his organization and hundreds of people flocked to the comments to answer him [1]. Based upon some of the replies there are secondary considerations that override the concept of "national service" and stop people from working in this space.
[1] https://www.linkedin.com/posts/don-yeske-b7957510_peoplefirs...
Edit: I also want to point out that there are many tech jobs available in the government sector (state / transit / local / etc). They generally pay less, but are also less restrictive. You don't have to sign up for an intelligence service (and everything that means) to serve your country.