People are so confused about this.
Apple already scan your photos for
- trees
- dogs
- cats
- ice cream cones
- grass
- sky
- the Moon
- etc.
This is just one more scan, and it’s even less invasive because it’s not based on actual AI analysis of your photos but by comparing hashes of them to hashes of known certified CP. Apple’s not looking at your pics, just smelling them next to a turd and applying a super-precise 1-error-in-a-trillion “turd or not” label. It’s not a backdoor, or even looking for dogs and trees was a backdoor by this logic.
The difference is that this could get you suspended from iCloud and in some cases (is Apple supposed not to report a big pedo “whale”? really?) reported to authorities, but only for multiple offences.
This is like mask mandates and vaccines, a collective sacrifice to get this crap out of the internet. Of course there’s no silver bullet and companies experiment with way to approach this.