Apple was only going to scan images that were going to be uploaded to iCloud. It would be the same amount of coverage as what google does, and if you believe apples claims “more private” because it happens locally and would later let them roll out encrypted images on iCloud while still scanning for CSAM to satisfy the government.
Of course you would have to trust that the policy of only iCloud images would stay in place after they implemented a tool to scan everything on your phone, which seems like a terrible bet.