make an app like PayPal for apps? I think it's really great, the simplicity is a plus.  Paying with cryptocurrencies makes their services more accessible to those who may be struggling with banks and PayPal or other sites that charge fees even if they're going through Bitcoin as you would make an app like PayPal and go paying your rent using another cryptocurrency instead of cash. You can use various payments methods such as bitcoin so this seems extremely practical indeed in practice because everyone on earth has cards now - just imagine not having to change them twice every two weeks all-day