The phrase "overnight millionaires" refers to people who become very rich or gain a lot of money suddenly or quickly, often without much effort or hard work. Full definition
People drawn to these rewards say they're not becoming overnight millionaires, but every little bit they earn counts. (creditcards.com)
Don't get trapped with all those «fake overnight millionaires traders» and all that BS guru stuff. (biggerpockets.com)
According to media outlets, Zhou described digital banking as an unavoidable part of the destiny financial system, and he cautioned opposite the suppositional projects that have made overnight millionaires but that have involved the viability and sustainability of financial markets. (cryptocurrency.rodipex.com)