Oh dear, not so private. Webkit browser engine flaw has been leaking user ID and browser data since iOS 15 went live in September 2021
News WebKit
Safari Proposal Takes Aim At Google, Facebook Advertising
Apple WebKit proposes privacy-focused compromise for ad-tracking in Safari web browser
Nintendo Switch Hacked Via Built-In WebKit Exploit
The console has only been out for two weeks and already has hackers cracking it
Google Drops WebKit Rendering For Chrome, Opts For Blink
Google is dropping its involvement with the WebKit rendering engine to focus on its own open source alternative
Opera Abandons Proprietary Engine, Chooses WebKit And Chromium
Presto layout engine dies in 2013
RSA 2012: Zero-Day WebKit Flaw Allows Android Device Takeover
Start-up CrowdStrike will demonstrate the use of a flaw in Android WebKit to take full control of mobile devices
RIM Releases BlackBerry 6 Developer Tools
The new developer kit supports new user interface features, deeper integration with BlackBerry smartphones and access to new services