I don't understand how this is news to people. Bitcoin was designed to be a secure, distributed, anonymous country. What do you expect to happen when you stop relying on Bitcoin to store your money and start relying on some random Polish webapp?
Didn't mean to disparage Polish software development; just was assuming the average user of the site wasn't Polish, leaving them even less legal security— which I see, glancing at the site now, was wrong. So apologies to any offended.
With that said, I think you could pick a better site to be the shining beacon of Poland's world class talent than the site that just lost a bunch of people's money because the only place they were keeping it was on a single EC2 instance store. If this is the top, I'm not sure I wanna see the rest of the class.
These particular developers, though, were probably not world-class. Data this important simply should not be lost due to trouble with an EC2 instance; any data on an EC2 instance, even on EBS (though somewhat less so for EBS) should be considered liable to vanish at any moment.
