It's a non issue. I could just as easily craft a client update that will create 50 billion coins and make them spendable only by me. This type of attack is possible on ANY coin.
Hey you can't help there being critics. I actually mine this coin and have quite a few, it's just that the users have to literally put all their trust in Artos that he won't do anything abusive such as making the coins spendable again or abusing the coin mixing service somehow.