That is true for many nations, specially for African nations for example. The "west" has sent in total of hundreds of billions of dollars total, maybe even more, but some places still do not have clean drinking water. The other day Mr. Beast ended up raising money to build clean water sources for African villages again, and yet when you look at the older ones he already did, nearly half of them are gone.
So this begs the question, why? And what can be done about it? I am not sure, and I do not have the answer for it, but as long as the aid you send, ends up not aiding, then it's going to stay bad. You have to move forward by putting on top of each aid to keep it going better, if you just do the same again and again, it just won't help.
As far as I know, Africa has the largest reserves of gold and diamonds in the world and the production from here is much higher than almost any other place in the world. Why is there poverty in Africa?
The simple answer is colonial rule. Although African countries are independent, but they are still working as a non-colonial area where people in the governments of the countries are helping the country's wealth to spread abroad by resorting to corruption. The simple thing here is that if they were not involved in corruption, African countries would not have gone through so much poverty.