They are doing stuff like that, but it doesn't make for sexy clickbait, so nobody posts it. For example, last week Microsoft released a patch for an exchange server exploit that NSA discovered and reported.
Energy effort here: https://www.energy.gov/national-security-safety/cybersecurit...
I think the second one might be more important, because it is generally known who the big crews are, and it is actually easy to screw up the opsec on crypto.
Also it does mean bad PR on their part. Which that is part of cultural warfare.
This seems like normal old grey programming to me.