Because the incompetence of the people behind it was never in question. When it started as a Bitcoin exchange, the user's password was shown as part of the URL, a level of security equivalent to putting your front door key outside under the mat, then leaving the door wide open anyway.
Despite that, some people think they've lost a pile of the things. Favourite comments, starting with how much someone had there:
Over 550 btc ((...still about $300k))
Wow... People have a lot of money.
This entry was originally posted at http://lovingboth.dreamwidth.org/513785.html, because despite having a permanent account, I have had enough of LJ's current owners trying to be evil. Please comment there using OpenID - have and if you have an LJ account, you can use it for your OpenID account. Or just join Dreamwidth! It only took a couple of minutes to copy all my entries here to there.