If you have doubts regarding the site then don't use it. Your problem can be solved as simple as that.
Can you not think of a reason why they chose a payment with no dispute option? It's because if they accept a payment with a dispute option, then people will just buy use their service a lot of times and just dispute the payment. Anyway, it seems like you weren't scammed at all or anything so I don't see the point of this Scam Accusation.