When I go to https://leaks.psylo.app on "Possible IP leaks" side I see only "WebAuthn" with my real IP and, occasionally, WebTransport with an incorrect IP. For "HTTPS Traffic" it always show some other relay. Using Safari 26.5

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.

Webauthn is the api for Passkeys and things.

Weird advertising on site: "Psylo is our privacy-first browser for iOS and iPadOS"

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).

I love iCloud private relay, but I need a way to turn it off. A command line utility would be amazing, along with the ability to turn off/on DNS-over-HTTP.

You can turn if off in settings > iCloud. Either temporary for a day and auto back on, or permanently until you turn it back on.

Yep, but one cannot script that, make it a part of a bash or automator actions, which is a problem.

Have you tried recording UI events in Automator and saving it as an Application? Then you could execute the .app via script. I haven't done this but in theory it should work.