Under what circumstances would you be violating Google Maps policy while travelling and how does it lead you to lose your enture business on Google services. Something doesn't smell right
But it's really your own fault for not having high reaching contacts into Google's upper tier!
i do not know what policy specifically could lead to a ban due to a use of map reviews while traveling internationally but at this point this is what many of us have come to expect from google as a matter of course.