It's a reference to the "big fight"....worth at least 100 million dollars to each participant, 400 million (+) to investors.
It's been touted as the most lucrative sport event in history....which attracts more viewers and bettors.
Does this boil down to athletic prowess, or sport propaganda for profit?
(My personal opinion is that boxing is no better than dog-fighting, and violence for its own sake isn't entertaining. But that's not how it's viewed by those buying tickets for the venue, or placing bets on the outcome.)