TThe blockchain network happens to be a place in which I've seen many new things and occurrences, making me left without surprises as much as I used to when I find another. Over these years of using the internet actively, I have never come across a website that would clearly write "Forbidden" on its main page. I did saw one in an exchange platforms website and even downloaded the image as you can find it below.
This website belongs to the Nanu exchange platform which is a Brazilian exchange platform. The website still exist but doesn't grant a person permission to check it out. This is a valid proof that they are no longer functioning.