This apparently goes back to the very first 1 Billion buy-in tournament on pokerstars.net, Mar 29, 2015. Barry Greenstein won the inaugural Billionaire Club Championship on PokerStars with 2003 WSOP Main Event winner Chris Moneymaker coming in second.
Places paid: 4
barryg1 – Team PokerStars Pro Barry Greenstein – 13,950,000,000
Money800 – Team PokerStars Pro Chris Moneymaker – 9,300,000,000
Mack.e.Knife – USA- 4,650,000,000
cashcard52 – USA- 3,100,000,000
However, when it made it's way into the pokerprolabs system, players who cashed were attributed negative numbers:
"When the final cards were dealt, barryg1 earned -2,147,483,648.00 for the win, while money800 settled for a consolation prize of -2,147,483,648.00."
http://pokerprolabs.com/...ee9e9cda139ced018198985