Calling it "scanning for child sex content" is a mistake. Finding CSAM is just the claimed initial intended use. Call it what it is, not what it's allegedly for:
"Mandatory submission of all private communication to the government" (either govt. employees, contractors, or AI systems running on your device but answering to someone else).
"Mandatory submission of all private communication to the government" (either govt. employees, contractors, or AI systems running on your device but answering to someone else).