
Filled with spies, hackers, arms dealers, and a few unsung heroes, written like a thriller and a reference, This Is How They Tell Me the World Ends is an astonishing feat of journalism. Based on years of reporting and hundreds of interviews, The New York Times reporter Nicole Perlroth lifts the curtain on a market in shadow, revealing the urgent threat faced by us all if we cannot bring the global cyber arms race to heel.
I don't have it in front of me, but I'm talking about the "nobody but us" era of exploit markets:
https://en.wikipedia.org/wiki/NOBUS
Where the NSA seemingly was buying anything, even if not worthwhile, as a form of "munitions collection" to be used for the future attacks.
edit: this mostly ended in the US because other nations started paying more, add in more regulations (only a handful companies are allowed to sell these exploits internationally) and software companies starting to do basic security practices (along with ruling out their own bug bounties), it just mostly whimpered away.
Also relevant to the discussion, the book discusses how the public exploit markets are exploitive to the workers themselves (low payouts when state actors would pay more) and there are periods of times where there would be open revolts too (see 2009 "No More Free Bugs" movement, also discussed in the book).
Definitely worth it if you aren't aware of this history, I wasn't.
And IIRC most of those people who used to work for the NSA now work at private firms like the NSO group, which is pretty scary when you think about it. It's hard to blame them though, if I was being offered the amount of money they were given, I would probably take it as well.
I recommend the book 'This Is How They Tell Me the World Ends' by Nicole Perlroth, it gives some good insights into what is going on behind the scenes (though with some of the major events which have happened since it was published some things may be outdated. Either way it's a good read.)
We Are All Targets
Countdown to Zero Day
This Is How They Tell Me the World Ends (about the Zero Day market)
Cyber Warfare - Truth, Tactics, and Strategies
The Art of Cyberwarfare: An Investigator's Guide to Espionage, Ransomware, and Organized Cybercrime
This Is How They Tell Me the World Ends: The Cyberweapons Arms Race by Nicole Perlroth