The United Nations says it has been forced to cut food, cash payments and assistance to millions of people in many countries because of “a crippling funding crisis” that has seen its donations plummet by about half as acute hunger is hitting record levels
That was never the point. The point is precisely that many poor people will NOT see the money/food/help just like all the times before now.
I also assume that, even if they miraculously really all get it, you will have at least one boomer generation, so more people per area that need to be fed. You then need to immediately get education up and running. Things then need to be stable for decades to make the fertility rate drop. It is not a simple “costs X then solved forever worldwide” kind of thing. It is also not something we can somehow “force” on them, at least not by throwing money at the problem.