I'm not a fan of crypto, but having a stable currency that the local government can't inflate/manipulate for their own gain would go a long way in many developing countries.
Think about it this way, how much trade would the US have if our currency changed every 10-20 years and all of our old debt was effectively thrown out? How would people save to build a business? How secure would they feel investing in their own future?
Stable, to some degree, in all of those respects, since they are interdependent. Being stable with respect to any of the above indicates a degree of stability with respect to the rest. You can't be stable against gold without a degree of stability against USD, as USD/Gold is pretty stable, and arbitrage would close the gap. Likewise with local prices and income.
To be fair, it was fairly stable until about 2006. However the whole point of "being stable" is also to be stable in times of external stress. USD/Gold fails that one quite spectacularly.
If cryptos were stable, no-one would be making any money "investing" in them.
(Genuine) Q: How exactly would that lift anyone out of poverty?