I have 5 kids. I'm almost certain my photo library of 15 years has a few completely innocent pictures where a naked infant/toddler might be present. I do not have the time to search 10,000+ pics for material that could be taken completely out of context and reported to authorities without my knowledge. Plus, I have quite a few "intimate" photos of my wife in there as well.

I refuse to consent to a corporation searching through my device on the basis of "well just in case", as the ramifications of false positives can absolutely destroy someone's life. The unfortunate truth is that "for your security" is a farce, and people who are actually stupid enough to intentionally create that kind of material are gonna find ways to do it regardless of what the law says.

Scanning everyone's devices is a gross overreach and, given the way I've seen Google and other large corporations handle reports of actually-offensive material (i.e. they do fuck-all), I have serious doubts over the effectiveness of this program.