Cash app:

1) available to 350-700 million out if 8 billion people

2) requires gov ID - billions dont have this

3) requires modern device - billions dont have this

4) requires fiat rails - billions dont have this

5) requires fiat bank account - billions dont have this

6) requires email + pw - extra friction

It may be easy for nostr:npub1r0rs5q2gk0e3dk3nlc7gnu378ec6cnlenqp8a3cjhyzu6f8k5sgs4sq9ac

Not for most of world.