I am beginning to have another thought about this Bittrex because it seems is just beyond all this verification and the likes that they have been using as an excuse to deny people access to their funds.
Yep, that's the first thing I thought too, no other exchange suddenly introduces 0 BTC withdrawal limit for existing users that have made successful withdrawals many times in the past. All an action like that is going to achieve, is a support headache for Bittrex staff, and a lot of pissed off previously happy customers.