Yes, #Apple has decided to opt everyone on iOS 18 in to “Enhanced Visual Search” to identify landmarks in pictures and that is a bad thing (ask me before you do something like that, Apple). But also no, this doesn’t mean that your iPhone sends all your pictures to Apple with this feature. It sends vector data around that allows a pseudonymous match so the iPhone can add metadata on landmarks. See https://machinelearning.apple.com/research/homomorphic-encryption for more technical details.