https://wccftech.com/apple-could-allow-users-to-change-default-apps-in-ios-14/

Apple is working on functionality to allow users to change their default apps in iOS 14 and iPadOS 14. The company is also considering allowing rival music services to stream directly on the HomePod.

As per a new report by Bloomberg, Apple is finally considering opening up iOS 14 and iPadOS 14 to allow third-party apps to be set as default apps. Such a change could potentially allow users to set Chrome as their default browser instead of Safari, and even replace the default Mail and Calendar apps in iOS. Although users can currently delete Apple's first-party apps in iOS, there is no global setting that allows the operating system, and installed apps, to use third-party apps as defaults.