How does Brave find out when someone tips themselves?

So there is a policy against tipping yourself with granted BAT. I’m not sure I’ve ever received granted BAT or not. It always gets transferred into my Uphold wallet.
But here is my question: how does Brave know if someone tips themselves? With the way Brave is marketed as a privacy conscious browser, I think that’s a valid question.

So yes, the question is: what information does Brave store about users in order to determine if they are tipping themselves or not.

Why is nobody from Brave replying? Wrong subforum?

Your on the right subfourm, staff must be inactive / busy for the past couple of days.

I get this isn’t high priority, but over a week with no comment? Even more than that on reddit.