...
I think it's a matter of days before they close the business and go away with all money.
they are online since 2014 despite TONS of scam accusations (and shady behaviour) like listed even fake coins (coins with same ticker of most famous coin)... and they are always able to find new user for their platform.
Wallet in maintenance after big pumps, high transactions fees for ERC20... they are earning enough money with this model, it's very improbable they decide to close this business.
In the meantime, many things are changed from 2014 until now. For example, EU and KYC regulation, as I know Yobit is not in accordance with any laws. if they feel they are close to some punishment in a conspiracy to break the law, will leave the whole business immediately. Remember the case of BTC-e exchange.
Also, they had many unsatisfied and scammed formerly users, you never know what they are ready for.