Dorsey has been very vocal on helping Africa alleviate their standard of living with the help of crypto specially bitcoin. And as far as I can remember he traveled personally to Africa and talk to crypto enthusiast there. So it's not a question on why Dorsey is doing it, he believes and crypto thus spreading the word.

Jay-Z though, I'm someone in-between his intentions, anyhow, Africa and India are two huge places to begin with to help spread the adoption. India though might be a difficult task as the government is heavy against crypto.