i dont know why yobit still listing altcoin with zero network, seem its bad for trader, but for pumping group its easy to make moneyw with altcoin without network, so he can buy a lot altcoin then pump it and not woried about new deposit :: )
This is not only one bad thing that can happen to you. If you are careless you can send your funds coins from wallet to their which is in maintenance or on different fork then you can join Club. All this is even worse if you are miner, wasted time and wasted electricity. I'm on C CEX for now, i didn't notice they have problems with chains..