I know for sure that in unoccupied territories Ukrainians do great job keeping their communications reliably working (to the point that there are plenty of soft

I know for sure that in unoccupied territories Ukrainians do great job keeping their communications reliably working (to the point that there are plenty of software development businesses successfully doing their jobs despite of war) unless a rocket hits some piece of infrastructure nearby. Which sort of disproves your claim. Zero blackouts were caused by hacking, and multiple by explosions.