First of all, the NBA does have rules, and it can't be deliberately chaotic, because it will hurt fans and bring adverse effects to the interests of the entire NBA. Therefore, the NBA also stipulates that stars should not be absent from the game for no reason. Many teams hope that stars will not play in the last two games of the regular season to reserve their physical strength for the playoffs, but they all need the "forged" injury certificate of the team doctor, and of course they turn a blind eye to this NBA league.
Secondly, not all teams are so obedient, and some deliberately put it badly. For example, the king, who has been playing badly in recent years, has always wanted to win the first prize, and finally only got a flower-exploring prize, Evans. The most famous is 1996-97 Spurs. That season, General Robinson was reimbursed for the injury season, and the Spurs were ruined. As a result, they won the first prize and Duncan, the "Stone Buddha".