To kill one person is a crime, to slaughter thousands is to be a lord. If you have hundreds of billions, even a fart smells good. You, who make a living off traffic, even scamming donations, will definitely be criticized. Sun Yuchen studied at Peking University in 2007, then went to PA for his master's, graduated, and returned to China to start a business, probably around 2014. When Xianyu was first established in 2012, hardly anyone used it. It only started to gain popularity in recent years. So from the timeline perspective, it's highly unlikely that Brother Sun played with Xianyu.