Shared with You removed after iOS/iPadOS 15 but settings are still available in Messages, Photos, and Safari
An Apple senior advisor told me on a phone call that Messages “Shared with You” feature no longer functions after iOS/iPadOS 15. However, in iOS/iPadOS 17, the option is still available in Messages settings, Photos filters, and Safari Customize Start Page. The settings and filters appear to do nothing, so why are they still available?
Use Shared with You on your iPhone, iPad, and iPod touch - Apple Support