I think the type 3 Flag can't be Supported in this case. But I also know it's one large deposit away from someone losing their money. It needs a big red warning banner, but (the way I read it) can't get one right now. It's a rare case that doesn't seem to fit the Flag system, and a Newbie warning Flag seems insufficient.
I know this question is directed to Theymos, but let me also give my view.
The flag should stay. This kind of business is based on huge trust since they handle a lot of money. If it wasn't for the escrow fund (which by the way is unusual since we see so many services around here not depositing any escrow fund), then there would be so many victims around and who knows how many more victims there might be. I see some three user deposits 4 hours and 13 hours ago, eventually that escrow fund could get depleted.
I think this is similar to a person asking for a loan using collateral, but then they default the loan. You use collateral to get your money back, but your perspective and trust toward the borrower will definitely change forever.