> If you enable iCloud backups, it's scans the entire shebang.

Citation?

Do I need one? Where in iOS can you choose which folders to opt-into CSAM scanning? I only see an all-or-nothing option for iCloud photos.

Yes, you do need a citation, because I've not heard Apple (or anyone else) claim that iCloud Backups or iCloud Drive are being subject to CSAM scans.

From everything I've read, from Apple and other sources, if the photo is about to be uploaded to iCloud Photo Library then it is scanned for CSAM. If it's not, it isn't.

How does one choose individual photos to not upload?

You store the photos you want to keep private in another app. I'm sure there are lots in the App Store.

Still waiting on that citation.

If the default behavior is not to exclude photo rolls from this new feature, I'm not sure where the argument exists. Telling iOS users they should download some app to keep photos private is absurd.

If a photo is about to be uploaded to iCloud Photo Library then it is scanned for CSAM. If it's not, it isn't.

Still waiting on that citation.

Are we arguing the same thing? How does one opt-out a specific photo? It's not possible as far as I know.

I've no idea what your point is. I've tried offering answers for all these random questions, but I'm still waiting for you to offer a citation for the claim you made earlier.