Occam's would say that they are running out of cash, which doesn't mean they are scammers - but is a call for problems.
How come? Where does all of the shitload of fiat go that people send them daily? They might owe more than they have, but I can't think of a realistic scenario where this would be the reason why they have trouble sending wires.
Puzzling indeed, the bankrupt scenario hold less and less, as they are surely receiving millions of dollars with this new boom, but yet not a single wire is sent. They can receive USD but 'cannot' send USD through SWIFT system.
Maybe:
1) SWIFT ( conglomerate of banks ) blacklisted them from sending wires only.
2) they are under some kind of legal restrictions from sending wires.