Majority of cafes in Australia offer it. I don't think that many people order it, but enough for them to keep it available.

Uncertain, but it might be useful for a coffee place open at night :)

Lots of places have decaf in Korea.

Its pretty common where I live in Asia. Most people here dont particularly like the idea of caffeine at night, although late night coffee is rare where I live.

Never seen it in Africa, other than transit hubs with westerners.

Yeah wouldn’t want it on your menu in….America?