> It won't catch anything but the dumbest of dumb criminals, because those who care about CSAM can surely figure out a better way to share images, or find a way to obfuscate their images enough to bypass the system (the lower the false positive rate, the easier it must be to trick the system).

Given the reported numbers of illegal images detected by similar systems within Facebook and Google, I think it is very clear that this will catch a lot of illegal content.