Visa and Mastercard are taking a 3-4% cut of every single consumer payment made in much of the world. That ends up being a very, very big number.
There are many people all over the world without access to banking - they can't store money, they can't transfer money, and they can't invest money. That may be someone who has poor credit in the US, or someone who's living in rural India or Africa. Without access to banking, you are essentially cut off from globalization.
If you live in a country that has extremely tight currency and economic controls but with a corrupt government, and are experiencing hyperinflation (Zimbabwe, Venezuela, others https://tradingeconomics.com/country-list/inflation-rate), access to alternative currencies can literally be the difference between life and death for individuals, where the money you make on your salary will be worthless by the time you get your check.
Plenty of other examples. Whether this is a good solution I don't know, they just announced it.