I'm Not Really a Billionaire

Wu Yi received a challenge, that is, he had to pretend to be a "500 millionaire" for a year. After completing the task, he could receive a reward of one million. (Nominally he is the winner of the 700 million grand prize. After deducting income tax, he only has 560 million, so he is called the "500 million rich man", but in fact he only has 100,000 yuan in hand...) However, what is surprising is that, with the help of the name "500 millionaire", he actually became a real billionaire a year later! PS: To put it simply, this is actually the 2020 version of "One Million Pounds".