Fact is, we either trust Apple or not, since the OS and the hw are not open source.
This system sets a precedent, true.
Apple’s privacy track record is also a precedent and I’m inclined to give them more good faith than I would give others. For now.
Sifting thru the drama, the actual facts are that Apple was the last company standing that would make very few CSAM searches compared to others. They were the last to fall, not the first like some people are implying. Now they are opening up to doing more CSAM scans (like the others have done for years) and they devised what they feel is a more privacy-minded way to do it. The rest is slippery slopes for the sake of slippery slopes. They could become true or not. Stay hungry, stay vigilant.