Therein lies my skepticism. It's an industry that seems to be full of "oops we lost your money, trust me" problems. Malice becomes a lot more likely when life changing sums of money are involved.
Remember, a lot of these cryptocoins started out as toys, experiments or get-rich-quick schemes that were never seriously designed to handle millions of dollars. MtGox is perhaps the classic example here: the biggest Bitcoin exchange of its time started out life as a Magic the Gathering trading cards exchange, and just kept on hacking on that shitty codebase until it inevitably got pwned.