The answers to your questions are:
1. Yacht and rally car races.
2. Yes, well noticed! We call it “Null Island”.
3. No, but it would be nice if it were practical.
4. People scraping tiles.
5. Yes, because the distribution of traffic follows Zipf’s law.
6. If I have time.
@kb As I look more closely now, I think you can distinctly see McMurdo due south of NZ.
@vruba Ah, that would make sense, if that's the edge of Antarctica. I was having trouble filling it in mentally.