That’s not the same thing at all. It’s more like saying, let’s make another MySpace, but only for metal artists. Or a Facebook for only Swedish people.
Anyway, I would be most worried about the actual experience level of the creator of this, and if he is actually competent enough to do this securely. The fact alone that he has chosen PHP is a major concern, as PHP is notoriously difficult to secure compared to say a .Net solution.
BTW: The domain name is seriously cheesy. You should really reconsider that.
Also, why are you not using a proper front end framework? You’re developing this like it’s 1995. You need to use React, Angular or something to get a proper responsive SPA style web app. It would also immediately look a little bit nicer if you used Bootstrap or something similar. Or material design/polymer.
From what I can see and your choices you don’t seem well-versed in modern web development.
You should take this to heart and do something about it, and not mistake criticism for “hating” again.