The CPPA had bans on virtual child porn (e.g. using look-alike adult actresses or CGI), that was overturned by SCOTUS, and then Congress responded with the PROTECT act which tightened up those provisions. These laws on possession are practically unenforceable with modern technology, peer to peer file sharing, onion routing, and encrypted hard drives.
Thus, in order to make them enforcement, the government has to put surveillance at all egress and ingress points of our private/secure enclaves, whether it's at the point of storing it locally, or the point of uploading it to the cloud.
While I agree with the goal of eliminating child porn, should it come at the cost of an omnipresent government surveillance system everywhere? One that could be used for future laws that restrict other forms of content? How about anti-vax imagery? Anti-Semitic imagery? And with other governments of the world watching, especially authoritarian governments, how long until China, which had a similar system with Jingwang Weishi (https://en.wikipedia.org/wiki/Jingwang_Weishi) starts asking: hey, can you extend this to Falun Gong, Islamic, Hong Kong resistance, and Tiananmen square imagery? What if Thailand passes a law that requires Apple to scan for images insulting to the Thai Monarch, does Apple comply?
This is a very bad precedent. I liked the Apple that said no to the FBI instead of installing backdoors. I'd prefer if Apple get fined, and battle all the way to the Supreme Court to resist this.