Yobit.net is a scam I lost a reasonable amount of BTC there some years back so I won't even leave my money with them anymore.
I've traded with Yobit both for SCL and Signatum and it is worked just Fine.
I deposited ETh and it arrived on time
I withdraw SCL and the transaction was Fast
I traded ETH for BTC and it worked
There is no problem with Yobit as of the Moment