I used to think you could just use a warning that forces the user to follow specific instructions. But the author says this "impossible to ignore" warnings:

> It causes us to concentrate on the unhabitual-task at hand and not on whether we want to be throwing away our work

And in fact, I learned this the hard way. One time, while in a rush to meet up with some friends, I tried to sign out of a mobile app. I went to settings and scanned for the logout button, saw some red text, and clicked it. There was a warning, which I quickly clicked through. Then there was a dialog asking me to enter my password to confirm. I thought that was strange, but just then I got a notification that my friends were outside, and I quickly tapped the input box, auto-filled from my password manager, and headed out the door. Later on, I learned that I deleted my account.

I was very lucky that this happened to be an account for a service that I self host and backup regularly. I restored from backup and got my account back. But I shudder to think what would happen if it were my Google or iCloud account.

Honestly I don't know what the app developers could have done differently here. Maybe not put the sign out button next to the delete account button. But it goes to show that impossible-to-ignore warnings are totally possible to ignore