What I like about the standard Google Photos/Dropbox/OneDrive approach is that it's no secret you upload your photos to their computers, where they process them. They process them for useful features, and they process them to catch child abuse. But I understand clearly I upload it from my device to another device, and that other device can process these photos. I'm not a Google Photos customer mind you (as stated, I prefer other services than Google's), but I understand the premise, value add and what they do with my stuff on their computers. It’s not my device incriminating me, it’s someone else’s device that does that, someone else’s device I chose to send my things to. I understand that relationship.

I will not accept a relationship with a device I own, situated on my desk or in my pocket, where it try to start a process to incriminate me. That's not processing a personal device should be engaging in, even if this starts out gated behind the heavily pushed iCloud Photos (it’s technically opt in), even if the solution is technically sophisticated (it is), and even if there exist definitions of "privacy friendly" where this approach is more privacy friendly (you can argue that all day long). I just don't want a personal device to do this. If Apple wants to draw the line somewhere else than I want to draw it, that means I probably should not support that.