bittrex is a scam exchange and you should stay away from it.
there has been a lot of complains about it for over a year now and last year they finally scammed thousands of their users who were coming from certain countries. the reason why this was a scam is because they told these users that they could freely use their platform and trade there without any problem but overnight they decided they don't want to give service to these certain users and then without warning they closed all their accounts and stole all their funds without giving it back or giving any answer to them.
Where you have any information or proof? I'm still using Bittrex regularly for my exchanges! Everything is fine at this moment.
Anyway, I will consider your comments when used in large quantities!
my personal experience + you can check the scam accusation board + you can check the
profile of the owner for other complaints.
you don't have any problems possibly because you weren't from the 5 countries that they targeted for scam (Crimea, Iran, Cuba, North Korea, and Syria).