I'm not sure what would I use WebAuthn for, if ever, maybe I could disable it through "Feature Flags" menu?; regardless, I never treat Apple's services as "premium", since the email fingerprinting thing. I pay mainly for Hide My Email, just to organise things per domain, and it's cheap.

Thank you for uncovering this and for the website proving the bug.

I found and reported an IP leak to Apple in December 2025. The issue was caused by an EDNS Client Subnet (ECS) configuration problem in Akamai’s infrastructure, which could result in the client’s real IP being forwarded when it shouldn’t have been.

Apple confirmed the fix at the end of March 2026, and then I unexpectedly received a $5,000 Security Bounty in July.

Lots of these seem unnecessary, especially collecting "bandwidth usage" and "timestamps".

Correct me if I'm wrong but doesn't Apple disallow any actual 3rd party browser engines? Like, any browser on iOS that isn't the standard safari is just a skin on top of webkit/safari. It doesn't exactly inspire confidence that some third party browser will be able to implement things any better (as compared to like, running Firefox on Android, which actually implements the firefox browser engine).