I doubt he sold that many symbols and clothing and legendary or whatever. i think its not possible to make 29 billions whatever you do not even in 5 years of playing. Also the player base is not that big and i don't think he is the only seller of symbols / clothes / legendary so he could make that money. Its either hacking or the photo is just edited
I doubt that money is made by a fair play even paying real money to get legendarys or whatever that's 29 BILIONS there
Let's say you sell just URSUS with 10m each and still need 2.9bilions ursuses to sell to get that money