Those that collect data are responsible to keep them secure. This has nothing to do with cryptocurrencies. There are way more important data then people finances. Health, police, governments.
Do you think that data regarding health, police.etc is more important than the financial data? I have to disagree with you there. Even if the health records are leaked, what will be the use for the hacker? How he is going to monetize that information? On the other hand, in case the financial information is leaked, it can be used for all sort of criminal activities.