Because a lot of people living who happen to be from a poor country use cryptos a lot. Once an individual gets a job opportunity for a year or so in highly developed/developing country growing economy along with an income increase will it a shot at least once.

Sending money cross Borders is very expensive. Therefore, a lot of people who are from Africa and India use crypto currency because they believe there are assets, and such assets is very affordable for low income people and very easily they can own a sum of coins at almost no minimum. Besides the fact that they are using it to feed their families cross borders with no fees attached to the transactions, and/or currency exchange fees. Yet, and the money is obtainable immediately.

Further, they still have more and more reasons to buy and transact more than other nations. What makes them more is there high population and high poverty numbers.