I can see how system-wide blocking would be useful. I’m personally very conservative and wary about apps that I install on my iPhone (I don’t use any ad-supported apps) so the browser is the “attack surface” that I’m most concerned about.

I already use uBlock Origin and iCloud Private Relay (as advised in your original post). I also use Private Browser tabs and regularly remove all “Website Data” from Safari (minor inconvenience in that I have to re-login to sites that I have an account on).

I’ve just installed AdGuard on my iPhone to try it out but see that the DNS protection requires a Premium subscription (it now occurs to me that I could possibly install Wireguard to connect to my VPS where I’m already running my own DNS server). I’ve also `never looked into supervised mode; I always assumed it wasn’t relevant for personal devices.

Thanks for the reply.