If I were the dev and I was sitting on a good $700 million worth of coin, no matter how pure my original intentions were, there is just no way I wouldn't be quietly selling off the premine. Of course people will notice eventually, and the price would drop, but maybe I'd make 10 or 20 million in the process and be setup for life. Maybe the dev is an honourable guy, but there are few who would turn down that kind of cash.

Add to that the fact that the guy is anonymous. Where's the downside for him? Would there be any actually negative repercussions, apart from angry people in internet forums? I mean, if the guy actually follows through with the plan to distribute the coins, he's a huge sucker.