There seems to be some instability hitting many of the exchanges... I did have a Poloniex account till they kicked everyone with a Washington state address off the system, citing "state regulations." I sort of know what that was about (the pot industry using cryptos to evade state taxes-- weed is legal here) but it was still annoying.
I worry a bit about this as part of a bigger trend... people start exchanges on the whole premise that it's "no fee and low fee" and then reality comes calling when they discover it costs money to run a business. I also worry it's going to impact the long term adoption chances for cryptos... if you can't trade them, what good are they?