People seem to have forgotten about the 30% haircut they had to take when Bitfinex got hacked for like 130 million.
Do you think that freebitco.in will return all the coins if their hard wallet is hacked. 
There are risk involved if you are trading in an unregulated market.
and that is the how things must be and most of the gambling sites keeps only a small percent in their hot wallet and i can only tell that what Bitfinex did is just ridiculous and naive as they were really incompetent to safe guard users funds over seventy two million. 