This applies to both rich and poor countries, the way poorer countries get help is usually through foreign investment into local infrastructure (an example of this would be china's investment into africa) this means that they would normally hire local construction companies which could then be taxed more heavily or if done by a foreign construction company they then could be taxed, besides this they are also able to tax foreign investments. Arguably taxing foreign investment could mean it drives away investment, but there will always be investment interest where there is growth. The amount received through Foreign Direct Investment in only one region of Africa, Southern Africa in 2019 was 4.9 billion USD which is also the lowest amount on the continent, taxing even 1% of that is substantial due to the low cost of living in Africa. There is a issue with perception that most do not understand poorer countries do not require so much money and thus do not require a huge amount of people to tax. It is a sliding scale depending on the cost of living in a country. There are also many billionaires and rich in poorer countries there is no place on earth where they do not exist. Providing a low cost of living that is both high standard solves the main issues with poverty in poorer countries which is low productivity stemming from the time spent on basic needs like gathering water etc.... This can be alleviated if their basic needs are met.

Low cost, High standard of living achieved through various means i.e, subsidies, tax cuts, benefits.