There is a newly used term, World English (WE). It is nobody's mother tongue. It is spoken across the world, for example, at check-in desks, airports, international trade fairs, world cup football seasons, etc.
I read an article about this topic and it says that native speakers are not privileged anymore and they can't really manage WE. Is this that hard for native speakers? What they speak is also English so they should not have problems, in my opinion; but I may be thinking wrong.
What about World English is difficult for native speakers of English to use or understand?