Well I've actually paid for street food using lightning, and also use it regularly it to send money to my family using Strike. It's instant and practically free.
https://www.frbservices.org/financial-services/fednow/about....
China, the US, or Europe could even offer digital wallets to individuals in those countries if they could get KYC worked out. Venezuelans use USD via Zelle for example, not crypto.
https://www.coindesk.com/markets/2020/06/16/venezuela-is-a-t...