Because digital currencies more easier
you can save it on your phone, you don't need to hold on your bag
you can use it just one click for transaction!
Digital currencies like Bitcoin and Bitcoin cash can be used for the payments of goods and services without distance barriers. They are also non-refundable which prevents chargebacks as would be the case of PayPal and other centrally controlled means of exchange. Cryptocurrencies are decentralized and as such, you have full control on how you access, store, and transact with your funds.
you can transfer funds only less than 3sec, you only need address not needed other verification! just one click, also more easy than use a bank account!