There’s no reason this couldn’t classify as a non-profit if so organized. Again, stretching the limits, could classify as literary and educational. I’m not advocating this, I don’t own the site, but we gotta get creative to stay alive.
It’s getting easier and easier to do things on a shoestring budget now with the advent of cloud services. It’s easy to scale up and down as needed; and you can run apps entirely serverless now, which don’t even use individual servers but smaller services that in many cases are much more cost effective. (They’re basically pay per use.)
Not that any of this is possible for this site. I’m not sure how the backend is run but I would assume it’s a standard server app.