Not always. Sometimes they offer to build the infrastructure to help you mine your resources then snatching up almost all the profit leaving your country and its people still very poor. This is how and why China controls the world's rare earth magnets and other more exotic materials that modern tech relies on. It's modern imperialism.

Propaganda much?

Most of the countries that take this money are ending up destitute and owing China huge sums and some of the infrastructure has already started crumbling.