Macinstruct published a brief guide on protecting your privacy on Apple devices as a response to Apple’s CSAM detection plans.
We’re now encouraging readers to protect their privacy by disabling certain Apple features. In situations where privacy is a hard requirement, it may be necessary to consider using non-Apple hardware and software. This article provides an overview of our recommendations and your options.
It’s a decent guide except for the recommendation to disable iMessage in favor of SMS. iMessage is end-to-end encrypted, SMS is not. My advice for iMessage privacy is to prevent Messages from storing content in iCloud. When that happens, Apple has the capability to decrypt texts. On an iPhone or iPad, go to Settings > Profile Name > iCloud, and turn off the toggle for Messages. Then go to Settings > Messages > Keep Messages. Change it to auto-delete old messages after 30 days. Or, use a private messenger such as Signal.