Yobit is also serves a staking services long time ago but the exchange fame and credibility is not good so people are not trusting the exchange. But right now i think yobit is building the community again from the beginning and the volume is increasing each day which will be great for the future and people can forget the past
If I'm about to stake, I'll choose Binance, kucoin and Coinbase than yobit. Those bad experiences that other people that have made there can't be gone easily. But if the amount is really high, I might hold it rather than to entrust my whole funds to an exchange.
We don't hold the future and no matter how trustworthy they are, still they are an exchange and they can be hack anytime. It's your choice to stake your coins there but I think the coins they're staking are not the known ones.