I have not heard before Yobit to be a legitimate exchange.Its already world famous for listing scam coins.They don't bother about any newly released coin's legitimacy.All scam coins could be found listed there.But now only hearing the complaint that amount could not be withdrawn.

i think nowadays issues arising with more exchanges.Bittrex was considered to be a legit exchange and nowadays,it is accused for banning thousands of accounts without prior intimation and not even replying to support tickets.