The FBI will not go after this company for locking people out of accounts. There has been -0- evidence that the funds have been removed from customer wallets, just that customers have not been allowed to access them in some cases. If you are not from the US, you are going to have a REALLY hard time getting those funds back without hiring an attorney from the US, getting them to sue for it, then sharing with that lawyer. Its the same thing that happens when a US citizen looses money on a non US exchange. They have no recourse either. If the FEDS also ordered Bittrex to stop doing business with certain countries, there is absolutely nothing you can do even with a lawyer.
Long story short, If you are from a country that the US has blocked business dealing with, you are out of luck till that policy changes.
Im not saying its right or good, but this is not going to get resolved by petition.