I'll suggest that fragmentation - not having a single point to find all user data would reduce the impact of a breach. Dropbox is a higher value target than Joh

I'll suggest that fragmentation - not having a single point to find all user data would reduce the impact of a breach. Dropbox is a higher value target than John Doe. So hackers are probably less motivated. The user system itself may not be as secure, it may not need to be because a breach is isolated and an attacker would be less motivated. Just a thought that crossed my mind.