Your username in the fediverse is not honorfaz, but @honorfaz, just as an email. It’s the same for communities (or sublemmy, or whatever we decide to call it). It’s not c/something, but c/[email protected]. This is why everyone still has a unique handle, but no unique admin.
I’m on my own instance for example, running in my living room, and yet here we are, talking. Internet as it was intented.