The posters here seem completely unaware of what is going on in this world
Hackers exist, They've been hacking for money for years (once they realized that, rather than just destroy or getting data for the fun of it, they could sell their ill-gotten information or computer access as a career). They haven't been sitting around waiting for the government to go "Hey, anyone want some free money? Just find us a way to hack into the iPhone!". You can be sure these hackers already knew this exploit, and they just sold it to the governement, that's all.
Hackers are out to make money. They're already out there trying to get our personal information to sell to others, or use themselves. They're installing ransomware that encrypts your computer and extorts you to pay them. They're installing malware to create botnets in order to have a mass of computers at their control, to sell their use to whoever is willing to pay.
The goverment in just another buyer of their warez.