They are opening the door for a lot of questions like this. They didn't say (as far as I know) if this 30-number cover multiply upload sessions or it gets reset with every upload. I feel like this number gets reset to 0 each for each upload session. Somebody can deliberately safely upload 29 actual CSAM photos each time. I know Apple is not stupid, but you know the government and lawmakers will ask it for a smaller magical number...