This is built in to the system either with the three dots in the top right when viewing a photo or by tapping options when using the share menu. What about using an iPhone is not good for privacy? Like any other device it’s about how you have it setup and how you use it. Privacy is the default in quite a few areas.
Apples operating systems are propertiary and Apple does collect your data so that they can sell it to advertisers. You can't even operate their devices without an account
„Now that we’ve established that Apple collects and uses your data to serve ads, does it sell your data too? Turns out the answer is No, Apple doesn’t sell your data to third-party advertisers. The Cupertino giant possesses the exclusive rights of showing you ads on the App Store and other apps. This means your data is used by Apple to show ads, but not sold to any other advertisers.“