DO NOT CLICK ON THIS LINK
Why do you say that? I clicked it :-(
There's nothing dangerous, I think he's just warning us since well, it comes from a troll.
Looks like a new exchange, based on the new "good looking" exchanges, I would recommend keeping away from it
Edit: from looking at the original thread for kingcoiny, the admin seems OK at least at first glance.
He proved his name from dribbbble and linked his twitter account. kingcoiny was announced in march, no coin attached to the exchange.
Still, trade with caution.
The link isn't dangerous. From what I've seen so far KingCoiny looks like a trustworthy exchange. It wasn't "ninja" announced and the owner has made his identity public.
These are positive signs for an exchange, but it doesn't mean that anyone should entrust their entire portfolio with them. Only leave an amount of your coins that you are willing to lose, not only on KingCoiny, but on any exchange for that matter.