This is first time when I hear this website. And I don't know why people are going to use all these unknown websites and risk with their money when there are so many popular and reputable websites where you can buy Bitcoin without risk to loose money.
It's an 'exchange' mainly attracting users from Tunisia as pointed out above, very likely because these people don't have many other options to utilize due to the limitations that they are facing.
In the western world we have many options to choose from, but that's not the case for certain other countries, which is why people there are more likely to use what we consider unknown and unsafe exchanges.
I can't even imagine how difficult it is for some people to buy themselves into Bitcoin. There are hundreds of services in Europe alone allowing me to buy Bitcoin at any time of the day without hassle.
This is true and I don't see for it to be complicated to purchase up bitcoin even no matter which side of the world you reside on. There might be local exchangers to be their last option but actually if
just really explore and do put up a little effort on searching things up we would able to see that the world is wide and there are lots of ways to purchase on.
The problem is not in buying the bitcoins, it's what the exchanger can do with the restricted fiat currency that he gets from the transaction.
What can he do with the Tunisian dinars he receives?
In this example, the dinar is a "closed" currency, meaning that it is illegal to import or export from Tunisia.
Add in fiat inflation and a weakening official exchange rate (and usually a black market) then you get situations where Bitcoin in "closed fx" countries often trades at a premium to the dollar/euro price.