This is definitely a matter of perspective. I have had a Github account since 2010, and git comes installed on Linux and macOS.

I don't always have a server available to host an HTTP+FTP server on. Or want to pay for one, or spend time setting one up. I can trust that Github Pages will have reasonable uptime, and I won't have to monitor it at all.

> And if you already knew how to write/make HTML you'd for sure already know all of that too.

This seems unnecessarily aggressive, and I don't really understand where it's coming from.

BTW, you can absolutely host plain HTML with Github Pages. No SSG required.