Also they have reasons ($$$) besides tracking and advertising to keep me in their ecosystem.
It won't surprise me much if they start double dipping though, so I keep an eye on fairphones etc.
Think of the children!™
Additionally, both of the previous two comments are based on false equivalence[2]. The two technologies discussed (online certificate checking, and file hash detection) are not the same, nor do they affect the user's privacy in remotely the same way.
I would argue this thread has devolved into misinformation stemming from uneducated claims.
1. https://www.macrumors.com/2021/12/15/apple-nixes-csam-refere...