[lazyweb]

I'm using Graphene, but with the default Google captive portal settings. While yes, I am technically leaking my current public IP to Google servers, what does it actually tell them apart from the IP?

It's a generic user agent I believe and there's billions of (simple) HTTP requests hitting that endpoint. If you're using a stock Android (or even worse, like Samsung) it's the Play services and unkillable vendor background apps you should be worried about.

I'd argue it's a lot more conspicuous to network operators if you're using non-standard captive URLs.