Don't know why there should be a problem the accounts have to be verified anyway. Is it the Polish bank hanging onto the cash?
I think it's caused by the volume of cash and transactions they're shoving through. It's from one account, to many seemingly random SEPA accounts all over the place, while they're not registered as a payment processor or bank.
I wouldn't be surprised if this kind of thing raises red flags with the authorities and fraud prevention.
on a brighter note, my last withdrawal got through after just 15 days
requested it on 4 april, got through on 19 april.