It sucks that they are always being attacked.  Hopefully 2018 will be the year that they make enough to either buy better servers or buy better protection from attacks.  Almost all crypto sites uses cloudfares and I think that could be one of the reasons why these exchanges keep getting attacked.  Because even though the coins they trade are decentralized, the exchanges themselves are centralized and that is why I am hoping that exchanges like Bitshares and other decentralized exchanges will start listing smaller coins so that these smaller coins will have a fighting chance