[kictanet] Cheap AI coding labour?

Some developers are raising concerns privately that great initiatives such as Zindi are "cheaply buying AI code" from Africa https://zindi.africa/faq/data_scientists According to them, "Zindi runs high-value expertise programming competitions/ hackathons in Kenya and Nigeria... and demands code in exchange for low pay prizes. It is unfairly low-cost labour for them." See attached. Are their concerns valid?