What's mindboggling to me is the sheer number of spy satellites that were more or less each equivalent to Hubble.

There are estimated to have been something like seventeen of the KH-11 satellites, each one of which cost something like 2/3s of a Nimitz class aircraft carrier.

https://en.wikipedia.org/wiki/KH-11_Kennen

And there are an unknown number of its successor, but probably at least 3, where they updated it for stealth.

https://en.wikipedia.org/wiki/Misty_(satellite)

It feels like a parallel universe where what is a technical struggle and tour de force here, is churned out by the dozens.