Absolutely no one involved -- no one who conceived of this effort, no one who implemented it, and no one who defends it -- was under the impression that you couldn't get around this by not storing your images on iCloud. The idea is that it will catch pedophiles who aren't careful or tech-savvy enough, and such people exist, trust me. I suspect pedophiles aren't especially smarter than average, and most normal people aren't even going to be aware something like this exists.