Apple frequently decrypts icloud data including photos based on a valid warrant. This new local scanning method does not stop apple from complying and decrypting images like they have for years.
(Note: I have worked with law enforcement in the past specifically on a case involving Apple and two iCloud accounts. You submit a PDF of the valid warrant to Apple. Apple sends two emails one with the iCloud data encrypted. A second email with the decryption key.)
https://www.apple.com/legal/privacy/law-enforcement-guidelin...
(Note: I have worked with law enforcement in the past specifically on a case involving Apple and two iCloud accounts. You submit a PDF of the valid warrant to Apple. Apple sends two emails one with the iCloud data encrypted. A second email with the decryption key.)