I have been part of a crypto world for some years now and yobit are one of the absolute worst exchange. They have 0 customer support and they never update wallets because of that I have so many coins stuck over there.
The zero customer support is one of the riskier, any company that has zero customers will lose their reputation, Yobit has been an exchange where you exchange at your own risk, I have received payment when they are active in the signature campaign and also when I am active in their forum, but that doesn't mean that I have to be blind to all their wrong doing.