So what's your advice? Not use this website ever again?
Too early to talk about it. Untile they will not return all alt coins at least. Right now there are still possiblility it was just a scam..
Plus all this talk about selling exchange.. After Alex Green and Mintpal i personaly do not want to trade on "sold" exchange
Someone has told when they have repaid all the FIAT value (CNY-USD) they have the right to do not reimburse the cryptocurrency, is this true?
You mean if someone will try to sue them? Not sure.. in case of Mtgox it was not right at least, formaly after them bankruptcy all money and in btc and in usd had to be compensated.
From another side i guess if they will pay all cny it will be much harder to sue them in China since status of btc and especialy rest shit coins are not determine there, not as money not as property.