I'm sure they do have a way of dealing with it in Bing Maps - I assume they can display borders differently depending on the country of origin (I think that's t

I'm sure they do have a way of dealing with it in Bing Maps - I assume they can display borders differently depending on the country of origin (I think that's the common approach), but that has zero technological overlap with the presence or absence of Unicode flag codepoints in a system-level font.