the requirement is that they must be a native English speaker ..
English is not the world official languages, there is other nationalities and people over there ! And there is many people who can speak English better than many natives English speakers. So how will you know ?
Well you are not one for starters, I know plenty of Europeans who speak better English than I do and they would not be caught with this rule. This is an English language forum and this is my thread so I can make up my own rules, I can also change my rules if I see fit.