At the same time Apple and Google have lists of hard requirements for applications that can be extended to include these - especially if part of this change over is presenting unified shared objects for apps to use to launch browsers.
That’s true, but I still don’t believe there exists a technical solution to this problem; I think this should be solved via:
(1) App Store policy, including requiring apps to disclose that they can/do capture embedded web browsing activity as part of their privacy disclosures.
(2) Privacy regulation. This is a very intentional dark-pattern used to violate users’ expectation of privacy, and should be addressed.
(3) User education — users should never trust an app-presented web view.
(4) An HTTP header that websites can use to explicitly opt out of being rendered in embedded in-app browser, reinforced by App Store policy that requires apps to respect and not to work around that header
