Yeah but, you shouldn't have to verify yourself in order to withdraw cryptos, that's pretty stupid and the fact that they did it without any kind of notice is suspicious. Any other exchange has a limit on how much cryptos you can withdraw without verification but all of them let you withdraw at least something.
I think it's a scam to collect personal data, some DHS staff joined Bittrex in December.
http://uk.businessinsider.com/bittrex-hires-two-former-homeland-security-chiefs-amazon-security-exec-2017-12
If they were honest, Bittrex would have given people notice and a grace period to withdraw their funds.
As I result I can see that Bittrex are loosing market share, fallen down from number 2 spot to number 7 since they did this.
Why dont you upload your ID, have your account verified, withdraw your coins and never come back? I think some people dont have the proper IDs to have them verified. There are some people who have multi-accounts on the site which they dont want to be caught red handed wash trading low volume coins.