YoBit are scammers. There is a particular case where they are still listing an old fork of a coin which is essentially worthless. The only people that buy into it are people who are not aware of it because it uses the same name. They are not to be trusted and I would never ever leave my funds on their wallets, NEVER.
If you still use Yobit you should consider moving on to other exchanges.
Yes, I am never comfortable with this exchange, in terms of securities and the way they do things as what they are just after is the money instead of reputation, and they can list anything as long as they get paid. However, based on what you have said, I would not call them scammers because of that.
Anyone who enters the trading market should know that information and trading are like brothers and sisters and you cannot do one without the other. Therefore, even if you want to make use of the exchange, you should know better the coin you want to trade. That is not Yobit's job as far as I am concerned.