I think the idea is that average people have no clue what color they are. So they’d be forced to take it out to check and thus have to restart their PC. It’s a trick!

Altho, maybe I’m misunderstanding something because all the pins of all the electrical cords I’ve ever seen have been silver?

Can confirm. Thought UK was always gmt+0, Paris/Amsterdam/whatever GMT+1, etc. (thought it was the clock that changed, not the timezone, if you know what I mean)

No to all 3 questions afaik.