How is this any different to trading margins or futures?
Either you trust the exchange or you don't.
what's the matter here=? I don't understand....
The exchange is making money selling WAVES they bought at the ICO at a higher price to public. (they don't hold WAVES in their wallet, just selling the number on the ICO page well in advance)
Simply, you cannot sell WAVES (except the ones you bought at Yobit) but you can buy them. which means Yobit is simply dumping the risk on those who are unaware of this while making a very high guaranteed profit.