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Apart from Australia and New Zealand, the Southern hemisphere houses pretty much just the poorest countries. Poverty also correlates strongly with average temperature, so it increases as you approach the Equator from either side (oil-rich Sultanates included, since the countries are rich but the people are still poor).
For what it’s worth, many people here in Brazil use the phrase “global south” as a better alternative to “third world”, an expression which no longer makes sense since the fall of the USSR, and I haven’t ever seen anyone on the Left here be offended or bothered by it.
Rule 1 clearly says “posts have the following requirements”.