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
You are right,yobit is one scam exchange which many will avoid and as per the team discussion on the telegram, they may even implement their own exchange if the kucoin listing does not work out.And being a dividend token, major exchanges would not be listing PYN token AFAIK.
I think there is an issue with PYN and that is why it is not being listed on any exchanges. Monaco has token rewards system and it is listed on bittrex and binance so I don't think that is the issue.