I want to know what changed between 2016, when the FBI bought a tool to hack the San Bernardino shooters iPhone[1] for $900,000[2] and now — with presumably an up-to-date iPhone running 2019 iOS — that forced them to come to this conclusion.
1: https://www.engadget.com/2016/04/07/fbi-iphone-third-party-t...
2: https://www.engadget.com/2017/05/08/fbi-paid-900000-to-unloc...