A few years ago, NFL teams were allowed to sell advertisements to casinos in their home markets. The advertisements were limited to the upper-bowl category only. Many expected a great change in sales but that did not materialize. The link between NFL teams and casinos generated revenues which increased over the years. The NFL has expanded sponsor inventory so teams may sell to casinos. This will definitely change a lot over the next few years.
Currently, the restrictions are further reduced to even capture the lower-bowl category. This means that teams can now sell more sponsorship deals to casinos like naming rights to the NFL team home venues and media advertisements.