If you do some research on Yobit.net here (bitcointalk.org), you will find that lots of people got SCAMMED by using Yobit. Some people complained about missing funds, withdraw delays, other weird stuff. By the way, yobit is not consider as an exchange. Going back to PYN, why they can't get on binance/bittrex/OKex/Huobi? I mean they can't even get on cryptopia? C'mon