NBA Bans the Usage of Apparels From Brands Having No Contract To Them

The NBA banned the Supreme arm sleeve because there is no contract for players to wear the brand. And now the Nike banned the ninja headband because it doesn’t have the Nike logo on it. I understand it's a business for obvious reasons that the arm sleeve was banned. Or they banned this because it hooks the attention more than the shoes since it doesn't have a Nike logo, no promotion for the apparel sponsor. Just my opinion though but the freedom of the players to wear their desired gear for the ball game is just too much. Anyways, business is business and they had no choice but to obey the rules or else they will lose their job.