My homeserver runs Debian with Freedombox, and I’m using their GnuDIP ddns service, but it’s for free subdomains, not your own.
I used to have a script to update my own domain in Gandi console. I only stopped because I didn’t really need a domain for my home.
That’s a feature supporters of imperial thinks it has. Even if imperial/some special third option is better for guessing, the difference has to be big enough that it’s worth the hassle of having multiple systems or converting everyone again. If it’s not worth having two systems but it is worth converting everything , then you still have to keep or prove that it’s worth losing the conveniences of metric like 1 km = 1000 m , 1 L of water weighing 1 kg , water freezing and boiling at 0 and 100 °C