Have you ever hosted something github pages or netlify? Those are the situations I'm talking about, where an htaccess or any server side access control wouldn't work.

No, I haven't. But since you did not tell anyone about that requirement, how was I to guess it?

You're right. I assumed mentioning static site with Hugo or Jekyll was enough.

To clarify, it would be a static site with hosting on something like netlify or github or gitlab pages, where you don't have access to the server.