Some platforms actually do account for this by having special "developing countries" discounts, or some other euphemism like that. IIRC Gumroad is one that supports this.

>This number really varies based on where you live

No, it varies based on who you are. Even poor countries are full of rich people. They are usually part of the reason why their countries are poor.

This is a company, not a charity.

There is a hard price floor. They have to pay the Bing/Google search API costs.