It's not one-click, or at least it wasn't for me. I clicked the link in the sentence "If you prefer to opt out of letting Fi use and share your CPNI with Alphabet and Google services, you can do so by replying here", and it took me to the Google Fi homepage. I had to then click on Settings, "Privacy & Security", and finally on "Allow CPNI Sharing". Four clicks total.

I clicked it from my Fi device

4 is still far less effort than having to call Amazon to cancel your account (among the many providers that make opt out / cancel incredibly difficult)

You said one click. Now you've moved the goalposts to "less bad than [other company]."

It is one click if you are a normal Fi user

No it isn't. And I don't know what a "normal Fi user" is. This doesn't apply to non-Fi users.

Normal as in regular, not I pay for this but only use it every few months, like GGP

I clicked it from my Fi device too - and it automatically opened the Fi app, which doesn't have this setting.

It took a lot more than 4 clicks to figure out I needed to switch chrome to desktop mode AND needed to open the link in a new tab to make it stop opening the app.

Side rant - Wasn't HTML5 supposed to do away with the need for dedicated apps? Interaction with any corp is now split between web, app, and phone, all with different capabilities.

Huh, I did it yesterday and I clicked the 'here' link in the email and it took me to a page that said I was now opted out. I didn't have to do anything additional.

Interesting, I clicked on the link (from mac) and got a thank you for opting out page, nothing else.

I have a dedicated Google account for Fi, and it took me about 10 minutes to get past the identity verification challenge it threw at me when I tried to log in (for the first time in months) to opt out. I'm opted out now but it was a lot more than one click.

well, if you aren't using it, then it would be expected that you probably have more steps to login in after some time away

It's a carrier, it connects you to the internet. Why isn't "I haven't connected to my account in months" the expected state?

I am curious why people are using dedicated accounts for this? Are they afraid of bannination and losing mobile access? Is this a security measure?

I use a dedicated account for Fi because when Fi first came out I signed up with my main account they removed my access to Google Voice which I use heavily. They have since allowed both Fi and Voice on the same account but I am not bothering with switching my Fi account to my main at this point.

I also had a terrible experience with the link. Not only that, it's still me having to remove myself from an automated opt in! This makes zero sense!

Made me jump through 6 different pages on a phone where I was already signed in to Google, so ymmv.

Or perhaps there's an A-B testing going on to see how they might be able to tire people out by making the "one-click" opt out harder.

Not sure why you're getting downvoted. It was also a single click for me, in a browser.

single-click out-out: http://g.co/fi/cpni-opt-out

Only if you're already signed in to your Google account in your browser. They are initiating communication in one channel and not accepting a response in that same channel.