Instamined by the devs just like any other coin, including BTC. The only 'relatively fair' coin is NVC, where the devs publicly destroyed their coins after a massive hate attack on the forums.
NVC was pre-mine, and only less than half of the pre-mine were publicly destroyed.
I don't think insta-mine is as bad as pre-mine. Every coin has to start by rewarding early adopters, otherwise no one would help to promote it. If a coin start with sky high difficulty, it'll just be dead in the water with no one mining it. In the long term, the insta-mine portion is tiny compared to the total amount of coin that will be produced. You can think of the instamine as a bounty for early miners/adopters.