No Yobit is not scam, but newbie MUST stay away from it because many dead coin no updated.
This is one of the aspects from them that I truly despise. The exchange lists pretty much any utter shitcoin, even those that are dead. It is completely unmaintained in that regard.
Yobit support is famous of not such responsive.
I don't understand why that is. If they have trouble keeping up, they should just hire more support staff. You are right regarding the slowness of their support staff, which is something that we've observed in the past.
As far as the OP is concerned, there is really nothing to go on here. I don't plan on tagging the exchange unless I see reasonable proof for each case of scamming.