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.
You'll find no progressive government banning cryptocurrency when regulation is a far better option, but these governments from developing countries are misled into thinking they can succeed in baby sitting their over devalued local currencies. They should awake from their slumber, because the power is already in the hands of the people and they'll use it.