The NFL is one of the biggest sports leagues in the world, and certainly in the US. The commercial appeal of this kind of tournament is absolutely huge, and this means that there is an opportunity for sponsorship and potential benefits for companies that align themselves with the brand. This has proved to be true, and if you watch the coverage of an NFL game, you will notice the significant part that sponsorship plays in the sport.
Changes to the law have allowed NFL teams to align with casino brands offering live casino experiences, and even fantasy football and other gambling sites. This was not originally allowed in the NFL, but recent federal law changes have seen a variety of different teams take advantage of the considerable financing muscle of gambling companies.