Computers do a lot of if-then.
If it detects cat pictures, what evil thing is it going to do? Label it as a photo of a pet (I don't even know, I don't use a scanning phone)?
If it detects nudity, what kind of unwanted behavior might it exhibit then, report to legal guardians? Not the picture itself but even just that the device is being used for that.
I can see how this scanning+warning is more creepy than scanning+labeling cat pictures, even if the information screen tells you it was just used for this warning screen.
