Sooner or later all exchanges have to comply with local rules and regulation, every government now tightening rule against crypto and its trading, they want to monitor market, they are asking details of every traders that's why almost all exchanges are not tightening their KYC policy and decreasing withdrawal limit for unverified members.

Bittrex - Can banned you overnight without notice
Polo - Still working find with delay in support ticket
hitbtc- can withdraw/deposit without any limits if you are only withdrawing cryptos
yobit - can go offline overnight, not registered anywhere
Etherdelta - can't handle huge volume and can get hacked like recently their DNS server got hacked.