It is indeed a big risk seeing those news about exchanges being hacked and millions are being taken and I also feel the same way that personal information might have been taken to but I also have a feeling that the people behind these hacks might be a group linked to the owner of these exchanges also. You're dealing with huge amount of money and for sure your priority should be its security so for me that doesn't make sense and will only lead to one conclusion though nothing was proven yet that it might have been an inside job.