Most don't report it and don't pay taxes, hopefully they saved some money for a rainy day.
Some report PayPal, and other forms of payments that are not cash.
Edit: Interesting to see what was posted on here and specially those who decided not to answer the question. So many Americans living paycheck to paycheck... and unable to save!
Trump’s shutdown threatens Friday payday. Would you be able to live without a couple of paychecks?