Starting to seem more like poor customer service than outright scam at this point.
It is well known fact that they have very poor customer service compared to other exchange platform but i have never got any problem during withdrawal or deposits so i don't think we can simply call them scammers. But despite huge trading volume and fees they are collecting they haven't upgraded their support system. I think only 2-3 people are behind yobit so they can't give prompt reply on our support tickets.