Erm... I just paid my bus fare in cash today. Not everywhere uses PayPal or fancy fintech apps. Not that they are unavailable or anything, but most places in the world just aren't infected by Silicoin Valley hype culture.
I understand that many places in the world still use cash often. But as the world transitions to a more digital economy your country will eventually stop using cash. Thus my statement remains true: We cannot pay another human unless there is a corporation involved.
Many people still use cash since their digital infrastructure is not so good and their digital economy is not well backed up by the government. Maybe if there's an upgrade towards this and they could make their internet fasten up and have digital economy upgrades we can see many third world country would adopt this changes. Its just the government is the problem to make this transition to happen.
Bitcoin is one of the best alternative currencies as of now to use when it comes to digitalization currency. But I believe there is still the government that is open-minded when it comes to bitcoin, instead of stopping their people to use bitcoin they allow it, and becomes legal tender in their place. Banks and other regulated government agencies work together and if bitcoin is against you in your place, there is nothing you can do.