two scenarios: - Those images would either have to be actual CSAM (illegal to distribute in the first place and generally hard to get) - fake collision images

two scenarios: - Those images would either have to be actual CSAM (illegal to distribute in the first place and generally hard to get) - fake collision images are placed instead, and all that would do is push the multiple fake CSAM images to Apple's human reviewers who would then likely mark it as a false positive/spam. If the Apple reviewer makes a mistake and does report it as CSAM them the only risk (in the US) is law enforcement having probably cause for search & seizure to look for other CSAM.