>We've built trillions and trillions of dollars in infrastructure in the peace time since, and it seems fairly concentrated.
and thus is easily defended. It would be a pocket change - tens of millions - for AMZN to put say a Rheinmetall Skyshield https://en.wikipedia.org/wiki/Skyshield at the data center.
Considering how hard US military bases and radar systems have been hit (and those are not city-sized target) I am unconvinced that even AMZN's pocket change could realiably protect against the kind of attacks we see in this war