Reading the answer in the FAQ to the question, “Are my contributions and tips really anonymous?” I see a link https://anonize.org/ which has an expired certificate.
“Anonize is a core component enabling privacy in the Brave browser which has 4 million active users. As such, it is one of the most widely employed advanced cryptographic protocols in practice.”
It does not feel like they got this “advanced cryptography” thing covered if they can’t keep their site certificate up to date.