It seems to be the case that if you give someone a bunch of money, they'll stop wanting to change the world for the better. There are thousands of billionaires who could each end hunger and homelessness but have chosen not to.
The resources available to nation states dwarf those of billionaires, and it’s they’re specific actual job to do it, yet they too have failed to end hunger and homelessness. Bill Gates has sunk untold billions into humanitarian aid and its a drop in the ocean.