When you have a huge website like freebitco.in you are probably used to having people trying to hack you, consider how much money there must be if you could steal ALL the money in here, I am sure most of it is locked in cold storages so even if you can manage to hack them you would only be able to get to the hot wallet, but keeping that in mind even stealing all the money in the hot wallet would be a good money for the hackers efforts. Hence I believe wetsuit must be working overtime during the early days to make the security iron clad and probably still improves it whenever he finds a better way, this is his baby and he wouldn't want to see it get hurt with a hack. He will not stop defending but hackers will not stop attacking, it is a constant battle with every single big website.