Car owners can indeed get paid to put ads on their cars—a procedure known as “wrapping”—but some solicitations to join such advertising companies are scams. Unfortunately, this is a field where fraudsters abound. The sums that legitimate advertisers amount to a little extra income per month.
In contrast, scam-running firms often reach out to car owners offering unlimited sums, some of it upfront. But the one who ends up paying is you.