Wrong. There are 600,000 malaria deaths / year. Most children under 5.
A malaria vaccine deployed in the field costs $3/dose, and can be driven down with mass purchases or working with e.g., UNICEF.
Assuming 10:1 vaccines / lives saved, you just paid 18,000,000 to eliminate it. Try 100:1 (180M) and you still have a 80% of your investment left over. How many kids grow up healthy because of that? How many parents grow up grateful? If it's 10,000:1 is it a failure to "only" save 60,000 kids for your entire 2B investment?
And malaria vaccines have an economic ROI of 100s:1, making them one of the most effective charitable investments for lower income countries.
And that's just one of the global maladies that can be directly addressed in a meaningful way with proper investment. Usually, with a Billion-dollar investment, a self-sustaining program can be set up so you get 10x - 100x over the course of the program. You really don't understand how vital and helpful foreign aid is.
There are a number of other high impact things you might want to look into, that produce meaningful changes in a data-driven way.
- internet and accountability for rural schools in developing countries
- Vaccines of any kind save tons of lives
- food and relocation assistance for famine-striken areas
- Early childhood education is a massive economic ROI, and reduces unwanted population growth through women empowerment
- Antiviral treatment to prevent spread of HIV to children during childbirth
- Neonatal care in areas without sufficient infra etc etc
In some cases, 60-80% of children in developing countries who are affected by preventable diseases are treated by charitable organizations, often in cooperation with a developing local hospital system that is built in parallel until it is sustainable. The initial intervention is basically exclusively through foreign aid from major wealthy donors and governments.