Livecoin is a shady exchange but that doesn't mean any other exchange can't be shady. But as far as yobit goes many people might have had a few problems with yobit but all on all I have never seen a person experiencing scam from Yobit. They have a legendary member account who is continuously active here listening to various scam accusations of people. They might have been a lot slower in their customer support but at the end they play it quite safe with your funds unless you are foolish and yourself do some mistake.