Masternodes are centralized because they are hosted on servers online, which are centralized. The large majority of masternode owners host their nodes on the internet, I'd say that's pretty centralized.
Were else does a digital currency live?
You are an idiot. If it's on the internet its centralized. Where is this off planet distributed system you are alluding to?
Obviously by the internet, I meant servers such as those provided by Amazon which is exactly what I typed above the text enlarged, dont be a troll. Does hosting bitcoin nodes online impact the currency in any negative way that might hinder it's most important features? No, but hosting darkcoin's masternodes on servers online, of which most are, could potentially end darkoin's anonymity for a undefined amount of time should an attacker take down the servers drk's masternodes are hosted on.