On topic when draw.io (diagrams.net) realized that, from https://www.drawio.com/blog/move-diagrams-net/#io-domains

    There are two major problems with .io domains:

    The first is that the islands which should own the domain suffix, don't, thanks to a wonderful piece of modern day British Imperialism. If you ever feel the need to donate to us, please give it to a more worthy cause.

    Secondly, there was a security issue with the .io domain. In 2017, a researcher managed to take control of four of the seven authoritative name servers for the .io domain. We accept that mistakes can happen, strong processes limit the chances of them happening, but they still can.