Lately many people, especially Germans state that there are rumors of metin2.sg not being official. Ye that's true, they want to scam us. Out of joke, here is the official site of ymir and you can see which areas have licence of metin2.sg server files
About the other thing asking why tec can modate and make their own updates, thing is that since they have bought the license, they can modify and make their own updates as if they want. Why no one asked that when they changed the bonuses on sce,aqua etc?
Stop believing rumors, if you want to play and invest here, do it.
Have fun from a noob who is here since 2011