That's exactly what it is. These companies buy, research and stockpile exploits, and keep a few always at ready for when the currently deployed ones get burned. All exploits have a shelf life, and the more widely one is used, the more likely it is to get caught.
Because let's not forget: NSO and their ilk are not in the business of developing exploits. That's just their raw material. They are in the business of selling weapons-grade espionage and surveillance capabilities.
That's exactly what it is. These companies buy, research and stockpile exploits, and keep a few always at ready for when the currently deployed ones get burned. All exploits have a shelf life, and the more widely one is used, the more likely it is to get caught.
Because let's not forget: NSO and their ilk are not in the business of developing exploits. That's just their raw material. They are in the business of selling weapons-grade espionage and surveillance capabilities.