The existence of cryptocurrencies makes it possible to give every citizen in the world a stack of gold. The currency thus given out will not be valuable by itself – not at first. Time will have to pass in order for scarcity to change the value of the currencies. Nor will every currency succeed in making impoverished people wealthy.

But there are perspectives that are needed to have a good look at. There are still groups in some community or society that aren't computer literate. To know about bitcoin is still hardwork and not just by having an internet connection.
Poor people will just spend for their needs rather than going to an internet cafe and wait for weeks or even months to earn in an online job or something.
Everyone has their chance and way to change their social status in a social ladder.
But ending poverty is still a long process if everyone in a country are willing to contribute.