https://cyberlaw.stanford.edu/blog/2020/01/earn-it-act-how-b...
> Section 2258A of the law imposes duties on online service providers, such as Facebook and Tumblr and Dropbox and Gmail. The law mandates that providers must report CSAM when they discover it on their services, and then preserve what they’ve reported (because it’s evidence of a crime).
Apple is being its usual cryptic self about this, which is once again breeding uncertainty, but I still have hope in the end this will work out.
However since this is part of the opt-in iCloud photos sharing mechanism, it doesn’t appear they have started to exfiltrate data without consent.
I don't in know why you're assuming they have a backdoor built in already. The whole point is that they don't, but they're going to add one.
So they have always been one software update from non-opt-in data exfiltration and remain so.