Security at most bitcoin exchanges has greatly improved since the fall of Mt. Gox. Most bitcoin exchanges now use cold storage, multi-sig and proper key ceremonies to ensure that their bitcoin, ether or litecoin do not disappear in a puff of smoke. Bitcoin users are also far less likely to leave their bitcoin on exchanges and instead opt for secure hardware wallets like Trezor and KeepKey. We shouldn't forget that hackers need to make a living too, which makes me question whether they will now turn their attention to some of the big name poker rooms, casinos and sportsbooks who have now entered the btc world. Major internet gambling operators like Bovada, Americas Cardroom, 5Dimes and BetOnline now process large amounts of bitcoin every day for their players yet one has to question whether they have the necessary security architecture in place. Could the next Mt. Gox be a major online gambling site?