Note: cross ownership rules ( multiple sports )were amended in 1997 after was challenged in Anti-Trust litigation.
“After the antitrust litigation with the NASL in the 1980’s, the NFL continued to operate as if the cross-ownership ban was still in place, but would occasionally grant exceptions to the rule.
[22] The NFL did not change the way it operated until 1997 when Wayne Huizenga (Huizenga) was allowed to become owner of the Miami Dolphins, while still retaining his ownership of the Florida Panthers (National Hockey League (NHL)) and Florida Marlins (Major League Baseball (MLB)).
[23] Huizenga bought the Dolphins in 1993, but the team was placed in a trust subject to restricted ownership under NFL rules, since he was in conflict with the cross-ownership rules.
[24] The NFL could have forced Huizenga to sell one or more of his teams if it did not change its position on cross-ownership.
[25] Well, the NFL did change its stance on cross-ownership in 1997 when it amended the NFL Constitution and Bylaws to modify the rule with the 1997 Resolution FC-3.
[26] NFL owners voted, 24-5-1, with one abstention to allow team owners to own multiple other major sports franchises. “
“The new Rule allowed NFL team owner cross-ownership in another major league sports team if: (1) the other professional sports franchise was in the same city as the NFL team of the owner, or (2) the other league’s franchise was in a neutral city, meaning a city that is not currently occupied by an NFL team and is not characterized as a potential NFL city.
[33]This Rule helped to advance the NFL’s goal of limiting competition among team owners to the field.
[34] The NFL does not want a situation where the owners, who are also business partners, are competing against each other for revenue from tickets, sponsorships, and merchandise, which they share.
[35]Essentially the NFL is trying to prevent owners from competing with each other for sports and entertainment dollars in the same city.
[36] This would be the case if owners were allowed to own their NFL team in one city and a baseball team in a different NFL city; the owner of the baseball team would be competing with his business partner (the other NFL owner) for fans and revenue.”
https://greenberglawoffice.com/nfl-cross-ownership-rule/