if you guys do this just act under the assumption that he is trying to steal your money. if you just do lots of small trades and never keep very much in the way of funds on the exchange at any given time it could still prove to be a useful service even if he were a scammer.
I agree here.
One hast to be very careful - only trading small sums and send the funds back to your wallet again is a good deal.
Reputation and trust comes with time... The longer the exchange is online and the more volume it trades, the more trust will it receive.
I wish this particular exchange all the best, but I doubt it will catch on even among the darknet society of crypto.