You have a $20 bill, and you need to double it. You have 1 month, you must keep it in cash (No banks, cashapp, credit cards), you don’t have an address, a phone number, or and you can’t interact to people in public. using just the internet and an email, how do you double the money?
What do you expect me to do, download a $20 bill from the internet and print it??? I guess the only realistic option is to walk around busy places after everyone’s left and hope you stumble upon someone’s dropped wallet.