The National Football League has expressed concern over certain types of bets offered by prediction market apps. The league has written to these apps to reiterate its concerns.

The NFL's concerns are focused on what it considers to be objectionable bets, although specific details are not provided. Further information on the situation can be found through the source.

The league's actions indicate a desire to regulate or restrict certain types of trades on these platforms, but the full scope of its concerns and the response from the apps is not specified.