I have used digital money to buy things on Ebay and to buy DLC on digital games.
Digital money is classified as fiat money because it (Bitcoin for example) has not backed by any physical commodity or precious metal.
You could take foreigners/travelers money and give them money that is valid in the country they will be traveling to. You could charge for labor and make a business out of it.
Step-by-step explanation:
DO NOT USE IN APEX! YOU WILL GET BUSTED! I ALREADY USED THIS ANSWER!
1. Online shopping and registration for a program online
2. Because usually it is not backed up by any commodity such as gold or silver. While it is possible to have digital currency that is fully backed up by a commodity, most aren't.
3. some ways could be investing to get something back or trading
