This man bet his marriage on making it all the way to the super bowl.
You assume something that is pure speculation without proof. I certainly wouldn't be deterred by such an ultimatum, but I think that's just speculation or just a small part of the straw that broke the camel's back. As has been said, the FTX bet and other reasons I understand had much more weight in the separation than a simple childish anger.
It's not coincident that after FTX they separate ways. Married life is not easy when both of you are money-maker, both are going to have pride, and one fault of the other can resurface every now and then when they argue about something. The relationship can become toxic that way and it sounds very cruel when the fight is about money.
In my opinion, this reason may have had much more weight in the separation, not only because of the loss of money but also because of the stain on their reputation.
