I think they have to be the worst exchange I have used in my books, one time I ended up paying way more than any other exchange would charge for withdrawing an altcoin I think it was close to $100, it was an erc20 altcoins l and they just listed newly in the exchange and I was trying to take advantage;f the price difference on both exchange I was losing. I regret that transaction until today and not surprised when I see write up of how awful this exchange is.
Sometimes I wonder why they still have patronage, I remember seeing they have one of the worst withdrawal fees for Bitcoin transaction way back. Exchanges that are considered scammy don't even have such withdrawal fees. Also their customers service aren't as reliable as the top exchanges. Hitbtc overall is just a poor exchange as they get poor rating from all angles.