but still i don't like instamine done by a single person/small group, instead instamine done by everyone(or large horde of miners)at start is good
But that is the thing: It wasn't a single person (aka "the dev"). There was plenty of WTS 500 / 1000 / 10000 DRK for x.xx BTC from various people (at the start).
At any time, developers can bring down the course!
With the fictional 2mn coins of the airdrop that were never created because the airdrop never happened. Sure.
I don't think you are paying attention to DRK accumulation happening in the rich list since April and people are still talking about initial distribution. Millions have been bought. I'd be more worried with the #1 buyer in the richlist who owns like 314k (buying in batches through Mintpal), and others, who made the price from like 2-3mn market cap to over 60mn.