Apple previewed new privacy protections in iOS 15, iPadOS 15, macOS Monterey, and watchOS 8, which help users better control and manage access to their data. Mail Privacy Protection stops senders from using invisible pixels to collect information about the user. Siri processing is also moving on device, enabling requests to be processed without an internet connection, such as launching apps, setting timers and alarms, changing settings, or controlling music. iCloud Private Relay, Hide My Email, and expanded HomeKit Secure Video support, at no additional cost.
Source: https://www.helpnetsecurity.com/2021/06/08/apple-privacy-protections/